The format of an NFT (Non-Fungible Token) can vary depending on the blockchain platform it is created on, but the most common format is ERC-721 for Ethereum blockchain. This format defines a set of standards for creating unique digital assets that cannot be interchanged with each other. Each NFT contains a unique identifier, metadata, and ownership information that are stored on the blockchain, allowing for secure ownership and verification of authenticity. The metadata can include various information such as title, description, creator, and image or video file. The NFT can take the form of a digital image, video, audio, or other digital content.