Non-fungible tokens are not even necessarily digital. They are merely tokens[0] that are not fungible[1], as the name suggests. Digital non-fungible tokens are

Non-fungible tokens are not even necessarily digital. They are merely tokens[0] that are not fungible[1], as the name suggests. Digital non-fungible tokens are stored in a digital database, of which blockchain is one kind. [0] https://www.merriam-webster.com/dictionary/token https://www.merriam-webster.com/dictionary/token [1] https://en.wikipedia.org/wiki/Fungibility https://en.wikipedia.org/wiki/Fungibility