eBay Store and eBay Shop categories

From eBay US Customer Support:

Similar to a physical store, your eBay Store categories are the aisles and shelves that let you organize and display your items to buyers. By selecting the most appropriate category for your product, you’ll help buyers find your items in search results. You can also list your item in two categories.

• Your Store categories don't need to match eBay's categories.
• You can create as many as 300 Store categories and subcategories with up to three levels of categories. For example, a category named Sporting Goods can have two additional subcategories: Sporting Goods > Golf >Balls.
• A category named “Other items” will be created for listings that you didn’t assign to a Store category. You can edit these items to change their category.
• Each category name can consist of up to 30 characters.
• When you create a new listing, you can assign it to one of your Store categories in addition to a standard eBay category.
• You can add, rename, edit, move, and delete Store categories at any time.
• A category will not appear in your Store if there are no listings in it.
• You can move listings from one category to another.

Learn more about setting up an eBay Store in the following eBay US articles:

Getting started with eBay Stores

eBay Stores: Subscriptions & Fees