Having a good ecommerce product taxonomy is one of the biggest contributors of high traffic volume and conversion rates. It impacts the shopping experience, which translates to whether a shopper buys anything from your store.
In this guide, we’ll share what it is, why is it important and its best practices alongside real-life examples that you can reference.
What is product taxonomy?
Product taxonomy refers to the hierarchical structure used to categorize and organize products. It’s a structured system that makes it easier for customers to find what they want in the quickest way possible.
Here’s an example of product taxonomy in the fashion & apparel industry:
What are the key components of a product taxonomy?
Categories and subcategories: organizing for easy navigation
Product taxonomy starts with clear, hierarchical organization, making it easier for customers to navigate from broad categories to subcategories, and finally the product itself.
Imagine entering a physical store selling men’s wear looking for a black t-shirt. You would head to the tops section, locate where all the t-shirts are, and look out for black. It’s the same for ecommerce.
Tops would be the category and t-shirts would be the subcategory.
Attributes: adding specificity to search
Attributes are key details that describe products, allowing customers to refine their search, and find the item they’re looking for. These can include:
- Physical characteristics: Size, color, material
- Brand and style features: Brand name, fit type, or occasion
Taking the same example of black t-shirt. Attributes would be black, the shirt may be made of 100% cotton, and its available sizes may range from XS to XL.
What’s the difference between product taxonomy and site navigation?
Product taxonomy and site navigation get used interchangeably. They’re two different jobs.
Your product taxonomy is the structure behind your catalog. It decides what a product is.
Your site navigation is the route a shopper takes to reach it. It decides how a product gets found.
Go back to that men’s wear store. The taxonomy is the system in the stockroom that says this item is a t-shirt, it’s black, and it’s 100% cotton. The navigation is the signage on the shop floor pointing you to the tops section. You can move the signs around for a sale without touching anything in the stockroom.
It’s the same online. REI organizes its store around activities like Camp & Hike, while another retailer sells the same tents under a plain Tents category. Similar products, different route to them.
| Product taxonomy | Site navigation | |
|---|---|---|
| What it does | Decides what a product is | Decides how shoppers find it |
| Where it lives | Your product data and PIM | Menus, category pages and filters |
| The rule | Every product has one right home | One product can show up in lots of places |
| How often it changes | Rarely | All the time, with seasons and campaigns |
| Who looks after it | Your product data team | Your ecommerce and merchandising team |
| What it looks like when it breaks | Products missing from filters, wrong categories on marketplaces | Dead ends, too many clicks, empty category pages |
Here’s a quick way to tell them apart. If the fix belongs in your product data, it’s a taxonomy problem. If it belongs in a menu or a page layout, it’s a navigation problem.
Should your site navigation match your product taxonomy?
No. Build your navigation from your taxonomy rather than mirroring it.
Your taxonomy gets built once and changed carefully. Your navigation gets rebuilt all the time. Once you know which one you’re touching, the work gets a lot easier.
Browsers and searchers use your store differently
There are 2 types of site visitors, and your navigation has to work for both.
Browsers are casual. They may have little or no idea what they want, so they start with the navigation bar and click through categories, and they gravitate to the bestsellers and trending sections where social proof is strong.
Searchers know what they want. Someone after Salomon hiking shoes will either type that into the search bar, or click through to the Salomon brand page and pick the hiking subcategory.
Your taxonomy is what serves both. It gives the browser a menu that makes sense, and the searcher a filter that returns the right products.
Your structure stays put, your menus don’t
One taxonomy can power plenty of different menus. You can run an activity-led menu in summer, a gifting menu in December, and a plain product-type menu for your marketplace listings, all from the same catalog.
Every category you make browsable also becomes a category page Google can rank. Keep them distinct enough that each one earns its own page.
Attributes turn into filters
The filters down the side of a category page come straight from your attributes. If one supplier sends you “100% cotton” and another sends “Cotton”, your material filter treats them as two different things.
Standardize attribute values before you build filters on them. When a filter looks broken, check the data behind it first.
Seasonal categories belong in your navigation
“Holiday Gift Ideas”, “Winter Gear” and “Solutions for Sensitive Stomachs” aren’t taxonomy categories. They’re collections you put together using tags and attributes.
Keep them out of your core structure and you can launch one in November and retire it in January without touching your catalog.
Marketplaces have their own taxonomy
Google, Amazon, Walmart and Shopify all have their own product taxonomies. Yours doesn’t need to look like any of them.
What it needs is a clean mapping to each one. And that only works if your own structure is consistent to begin with.
Which layer do you fix?
Use the symptom to find the layer:
- Filters returning too few products: your attributes are inconsistent
- A shopper can’t find a product you definitely stock: it’s filed in the wrong category
- Marketplace listings getting rejected: your mapping is off
- Two category pages competing in Google: the categories are too similar
- Shoppers dropping off in the menu: too many layers, or labels that don’t make sense
- A category page that loads almost empty: your merchandising rule is too narrow
The first four are taxonomy problems. The last two are navigation.
What are standard product taxonomies, and should you use one?
You don’t have to invent your structure from scratch. A few are already published, and you’ll end up mapping to them anyway if you sell anywhere beyond your own site.
Google Product Taxonomy
Google publishes a list of 5,595 categories, sorted into 21 top-level groups like Apparel & Accessories and Home & Garden, and going up to seven levels deep.
These days Google assigns a category to your products automatically, using its own taxonomy that it keeps evolving. The published list is what you submit when you want to override that, and Google only accepts an override in three cases: meeting category-specific requirements, targeting Google Ads campaigns, and alcohol compliance.
The published file itself hasn’t been updated since 2021. Treat it as the vocabulary you submit in, not a live picture of how Google sorts your catalog.
Shopify’s Standard Product Taxonomy
Shopify’s version is open source and covers categories, attributes and attribute values together. It’s been updated regularly since 2024, so it’s the more current of the two.
If you sell on Shopify, it suggests a category for each product from your title, description and images, and you accept or reject it. Anything you leave unassigned saves as uncategorized. Shopify also maps across to Google’s categories, so you’re not doing that work twice.
So should you use one or build your own?
Build your own. A standard taxonomy is designed for everyone, which means it won’t match how your particular shoppers browse, and it won’t have the categories your customers ask for.
Then map yours to the standards for every channel you sell on. That mapping is what gets your products showing up in the right place on marketplaces, and what lets you override a channel’s automatic categorization when it gets your product wrong.
Plan for the maintenance. Every new product needs a mapping for every channel, and every time a channel updates its taxonomy, some of yours has to be redone.
Why is product taxonomy important?
Ecommerce is competitive. When a shopper doesn’t find what they want, it’s easy for them to click into another store and search there. A good taxonomy is what keeps them on your site.
Improves SEO and searchability
When looking for products, shoppers have keywords and phrases in mind. If they’re shopping for a waterproof sofa that’s made with vegan leather, they’d search for those words.
It could be in another structure like “vegan leather sofa waterproof”, or with synonyms like “repels water”, or “faux leather”. With a strong product taxonomy that uses these keywords and phrases, you’ll be able to capture high-intent searches and drive traffic to your store.
Increased conversions and sales
A good ecommerce product taxonomy makes it easy for shoppers to find what they need. It can even direct them to a product they weren’t actively searching for.
That can greatly improve conversion rates, from traffic to purchase, as well as increase the average order value.
More enjoyable browsing experience
Not just for hard metrics like traffic and sales, a strong product taxonomy strategy also makes it much more enjoyable for users to browse.
There’s less friction and less frustration clicking around trying to find something. The result is more positive brand perception.
Richer customer insights
When products are properly grouped and presented, you get customer insights that are more actionable, like their browsing behavior, preferred products and budget preferences.
For example, if a product doesn’t do well, it could be because the category has insufficient demand or the product is too expensive in its category. You can then either choose to discontinue the product line or adjust prices accordingly. And you’ll only know this well with a good product taxonomy.
How do you build a product taxonomy?
The hard part isn’t the tooling, it’s the decisions. What your top level is, how deep to go, where each product belongs, and who gets to change it. Those questions are the same at 500 SKUs and 500,000.
Start with what you sell
Pull your full SKU list out of your PIM or ERP before you draw any boxes. Sort it by whatever you already have, product type, supplier, brand, and look at how it’s distributed.
Two things to count: how much sits in a catch-all “other” bucket, and how many near-duplicate categories you already have. In a 40,000-SKU apparel catalog that might look like 3,000 products under “Accessories, other”, plus separate categories for jackets, coats and outerwear all holding the same kind of product.
Set your top level
Your top level should be about 5 to 10 groups, broad enough that every product has an obvious home and narrow enough that the groups don’t overlap. For an apparel retailer that’s something like Women, Men, Kids, Shoes, Accessories and Home.
Names only need to be unambiguous and consistent. Decide “Jacket” or “Jackets” once and use it at every level. Shopper-facing wording is a navigation decision, and you can change it without touching the tree.
Once you have a draft, check it against a published taxonomy like Shopify’s to spot anything you’ve missed. Its attribute lists per category are worth borrowing outright.
Go three or four levels deep, then stop
Break each group down until you hit something a shopper would recognize as the thing they came to buy. Women > Tops > T-shirts is three levels and it’s clear what sits inside it.
When you’re tempted to add another level, check whether you’re splitting on an attribute. Women > Tops > T-shirts > Crew neck > Short sleeve > Cotton is six levels, and the last three are attributes. Size, color, material and price all belong in filters.
Write the rules down before anyone adds a product
Decide and write down: every product gets one home, category names follow one pattern, and one person approves new categories. For example, a men’s waterproof running jacket goes in Men > Outerwear > Rain jackets, not Men > Activewear, and “waterproof” and “running” are attributes.
Map it to your channels
Once the structure is stable, map each category to its equivalent in Google’s taxonomy, Shopify’s, and any marketplace you sell on. Keep the mapping alongside the taxonomy itself so it stays current as both change.
For Amazon, the Browse Tree Guides in Seller Central list the valid category paths, node IDs and required attributes for each category, which is what the mapping needs.
Some nodes won’t match one to one. Women > Tops > T-shirts maps cleanly to Google’s Apparel & Accessories > Clothing > Shirts & Tops. Rain jackets has no equivalent at all, Google files those under Outerwear > Coats & Jackets.
Test it before you commit
File a sample of products through the new structure, including any that could sit in two places: a swim cover-up, a fleece-lined legging, a gift set spanning three categories. Those are the cases that tell you whether the rules hold.
Then have someone who didn’t build it find a few specific products using only the menu. Their route through the tree tells you whether the labels read the way you intended.
Product taxonomy best practices
Map customer behavior
Successful taxonomies reflect how customers think and shop. Conduct analysis through surveys, user testing, or keyword research to identify common search terms and shopping patterns. If customers often search for seasonal or solution-based categories like “Holiday Gift Ideas” or “Skin Care for Dry Skin”, incorporating these into your taxonomy can make their experience more intuitive.
Use Hypotenuse AI’s automated product tagging tool to label your products with the appropriate product tags to ensure they fall under the right category.
Keep it logical and intuitive
Avoid overwhelming shoppers with too many layers. A clean, streamlined hierarchy ensures users can navigate quickly. For example, instead of a complicated tree with Men’s Shoes > Formal > Leather > Size 10, simplify it to Men’s Shoes > Formal Shoes, with filters for size and material. Take inspiration from successful brands in your industry. Make sure to tailor your categorization to your unique offerings and audience. By benchmarking against brands that excel in ecommerce, you can refine your taxonomy to be both intuitive and relevant to your target market.
Optimize for SEO
Conduct keyword research using keyword research tools or automate it with Hypotenuse AI’s SEO keyword suggest feature.
Incorporate these into your categories, attributes and product descriptions so that the right product shows up when shoppers search.
It’s important to use synonyms so that no potential purchases go to waste.
Review and adjust regularly
Observe how shoppers interact with your taxonomy. Are they finding what they need quickly? Or are they confused and do they tend to click around for a long time before exiting your store? Tweak accordingly.
Plus, every now and then, there’s a new retail trend. Look out for this and create categories to ride on the trend. Make these categories prominent on your navigation bar and homepage.
Use AI to build and maintain your taxonomy
A taxonomy is manageable by hand at a few hundred SKUs. At thousands, it drifts: new products land in the wrong category, attribute names go inconsistent across suppliers, and near-duplicate categories creep in.
This is where AI now does the heavy lifting. Hypotenuse AI’s AI product categorization assigns every SKU to the right category in your hierarchy and keeps it consistent as your catalog grows, while AI taxonomy automation can construct or extend the taxonomy itself from your product data. Your team reviews the structure instead of building it cell by cell.
Product taxonomy examples
Glossier: minimalism with user-centric naming
Glossier’s product taxonomy aligns perfectly with its minimalist branding. Instead of overwhelming customers with industry jargon, they use straightforward, customer-friendly terms:
- Categories: Skincare, Makeup, Body, Fragrance.
- Descriptive filters: "Skin Type” and “Skin concern” filters
Glossier also leverages curated bundles and routine-based categories like "Morning Skincare Sets," allowing customers to shop based on needs rather than individual products.
REI: tailored to outdoor activities
REI caters to outdoor enthusiasts with a taxonomy that reflects how shoppers think about their adventures:
- Categories based on activities: Camp & Hike, Climb, Cycle, Water.
- Subcategories: Within “Camp & Hike,” you’ll find specific groupings like Tents, Lighting, and Hydration.
- Seasonal adjustments: "Winter Gear" or "Summer Essentials" emerge at relevant times.
Zalando: regional adaptability
As a pan-European fashion retailer, Zalando customizes its taxonomy to regional preferences. For example:
- Localized categories: "Rainwear" is emphasized in Nordic countries, while "Beachwear" takes prominence in Mediterranean regions.
- Occasion based search filters: Tailored to cultural and seasonal trends, such as "Festive Wear" in December or "Oktoberfest Outfits" in Germany.
- Trending categories: Currently popular sub-categories that are displayed on the home page.
This adaptability ensures customers in different markets find relevant categories at the right times, improving overall engagement.
Chewy: pet-centric taxonomy for variety
Chewy organizes its product catalog not only by product type but also by pet type:
- Primary categories: Dog, Cat, and Other Animals, which covers horse, bird, fish, reptile, small pet and farm animal
- Cross-cutting sections: Pharmacy and Services re-cut the same catalog by health need, like Flea & Tick, Heartworm or Allergy Relief, then by pet
- Specialty needs: Grain-Free, Hypoallergenic, or Age-Specific Food.
Chewy also integrates problem-solving categories like “Solutions for Sensitive Stomachs” or “Joint Health Supplements.” This personalized taxonomy aligns with how pet owners think about their purchases.
Frequently asked questions
Is product taxonomy the same as product categorization?
No. Your taxonomy is the structure. Categorization is what you do every time a new product comes in, deciding where it goes. You build the taxonomy once and look after it. You categorize constantly.
How many levels should a product taxonomy have?
Three or four levels works for most catalogs. If you find yourself wanting a fifth level, that detail is almost always an attribute. Put it in a filter instead.
Can a product sit in more than one category?
In your navigation, yes, and it usually should. A tent can sit under Camp & Hike and in a Gifts for Campers collection at the same time. In your taxonomy, it should have one home.
How often should a product taxonomy be reviewed?
Every quarter for most catalogs, and any time you add a category, a channel or a new market. Drift is gradual, so keep the review on a schedule.
Conclusion
An effective product taxonomy is the backbone of a successful ecommerce strategy. By organizing your products thoughtfully and intuitively, you can enhance searchability, improve the customer experience, and ultimately drive conversions.
A well-crafted taxonomy not only simplifies navigation but also tells a story about your brand, meeting customers where they are and guiding them seamlessly to where they want to be.
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