A feed is a file that contains a list of products you want to advertise through Merchant Center. When you add your products, you’ll assign attributes to each one. Your product feeds will use these attributes to group your products together. Once you’ve created a feed, it can be used multiple times across as many Merchant Center features as you need.
There are multiple types of feeds in Merchant Center. The types of feeds you use will depend on your needs as a retailer. The product attributes you use to describe your products to Merchant Center are the same across all types of feeds.