Every NFT has a set of Properties attached to it. Here is an example of how these are displayed on Gameflip:
Depending on the collection, creator and NFT, the set of Properties may vary to inform users what is included in the given NFT.
These could be utilities, an amazing property that range from cashback to exclusive access to communities and calls with your favorite influencer and all things in between. It can also give further details on the characteristics of the NFT, what are its art features, special descriptions, etc.
All NFT Properties are chosen by the NFT creator and are immutable, that way creators can be sure their NFTs will be used just the way they intended.