an Nft

Non-fungible token.
That doesn’t make it any clearer.

Right, sorry. “Non-fungible” more or less means that it’s unique and can’t be replaced with something else. For example, a bitcoin is fungible — trade one for another bitcoin, and you’ll have exactly the same thing.

A one-of-a-kind trading card, however, is non-fungible. If you traded it for a different card, you’d have something completely different. You gave up a Squirtle, and got a 1909 T206 Honus Wagner, which StadiumTalk calls “the Mona Lisa of baseball cards.” (I’ll take their word for it.)

How do NFTs work?
At a very high level, most NFTs are part of the Ethereum blockchain, though other blockchains have implemented their own version of NFTs. Ethereum is a cryptocurrency, like bitcoin or dogecoin, but its blockchain also keeps track of who’s holding and trading NFTs.

Tux, the Linux mascot