Utility in the NFT world refers to functions or benefits an NFT provides beyond being a digital image or collectible. For instance, some NFTs are used to grant access to a community, unlock features, serve as event tickets, or represent items within a game.
The idea is that an NFT with utility offers a reason to hold it besides speculation on its price. A membership pass or in-game item, for example, has a use tied to something the holder can actually do, rather than resting purely on hoped-for resale value.
It is important to be realistic, though. Promised utility may never materialise, and even genuine utility does not guarantee that an NFT holds or gains value. This entry explains the term. It is educational and does not suggest buying any NFT based on claimed utility or otherwise.