NFT
In short An NFT (non-fungible token) is a unique blockchain token that represents ownership of a specific item, such as artwork, a collectible, or an in-game asset.
An NFT, or non-fungible token, is a token where each unit is unique and not interchangeable. One bitcoin equals any other bitcoin, but NFT number 412 in a collection is a distinct item with its own ID and history. NFTs are used for digital art, collectibles, game items, event tickets, domain names, and membership passes.
On Ethereum and other EVM chains, NFTs usually follow the ERC-721 standard, or ERC-1155 for contracts that handle many items at once. The contract records which wallet owns each token ID and points to metadata, a file describing the item's name, traits, and image. That metadata may sit on-chain, on decentralized storage such as IPFS or Arweave, or on an ordinary web server. Solana has its own token standards for the same purpose.
What you own is the token, not necessarily the image or the rights to it. If the metadata lives on a server the team controls, the picture can change or disappear. Copyright and commercial rights depend on the project's license, not on holding the NFT. NFTs are also illiquid: a collection's floor price can look solid until you try to sell and find only a few low bids.
Before buying, check the contract address on the marketplace against official sources, since fake collections copy names and images. See where the metadata is stored and whether the contract is upgradable. Be careful with signature requests on mint sites; wallet drainers often hide behind fake mints, airdrops, and claim pages that ask for broad approvals.