An NFT is a non-fungible token, a unique on-chain asset created by minting a record in a smart contract. Ownership and provenance are enforced by the contract, and each transfer moves the token between addresses with the change permanently recorded. ERC-721 covers single assets and ERC-1155 supports batchable or semi-fungible items. Common uses include art, collectibles, game items, tickets, and credentials.
A token ID is the per-asset identifier inside an NFT contract. Combined with the contract address and the chain, it uniquely identifies one token on chain.
An NFT represents a specific asset or claim and its utility depends on the apps that read its metadata. A blockchain domain is often implemented as an NFT, but it embeds a human-readable name under a naming protocol with resolution rules.
Ownership lets the holder set records that map the name to wallet addresses, content identifiers, and services. Names are globally unique within their namespace and can create subdomains, and some systems require renewal.
Regular NFTs do not provide DNS-like records, name resolution, or subdomains. In many systems, registering a blockchain domain mints the corresponding domain NFT.