AppStore - iOS Primary Category

The Primary Category is the first Category assigned to your app within your developer account and will determine what Category your app will appear under within the App Store. 

Categories on the App Store help people discover new apps to meet their needs. The primary category you select is particularly important for your appʼs discoverability on the App Store, and it helps people find your app when browsing the App Store or filtering search results. The primary category also determines whether your app appears in the Apps tab or Games tab on the App Store. You can also select a secondary category to help our algorithm better surface your app. 

To decide which category will best serve your app, consider your app's purpose. Your primary category should be the one that best describes the main function or subject matter of your app. We most commonly see the category of "Entertainment" with our client apps.