# NFT Tokens A **non-fungible token is a unit of data stored on a blockchain**, that certifies a digital asset to be unique and therefore not interchangeable. It means that NFTs are unique. They **cannot be duplicated or replaced** - only one token can exist. Ethereum allows users to easily store, create and send NFT tokens, therefore the **Ethereum network** is the market leader. NFTs can be used to represent items such as photos, videos, audio, and other types of digital files. NFTs are frequently used to sell a wide range of virtual collectibles, including NBA virtual trading cards, music, digital images, video clips, and even virtual real estate in a virtual world.\ \ In this case, **NFT technology allows us to create and store unique horses as NFT tokens**. Each horse is different and has its own unique characteristics. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://zkrace.gitbook.io/whitepaper/technical-summary/nft-tokens.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.