Where nfts are stored?

There are a few options for storing non fungible tokens. You can store them on a blockchain, in a database, or in a cloud storage system. Each option has its own advantages and disadvantages. Blockchain storage is secure and permanent, but it can be slow and expensive. Database storage is fast and cheap, but it's not as secure as blockchain storage. Cloud storage is the most affordable option, but it's not as secure as the other two options. So it's up to you to decide which option is best for you based on your specific needs and preferences