Here are examples of NFTs
NFTs come in many shapes and sizes and they come on many blockchains.
Sometimes they're static like old baseball cards. This is a 1-of-1 unique artwork example.
Static example - click to view the asset
Sometimes they have motion, or sound, or both.
Motion example - click to view the asset
Sometimes they have a utility, a use case, like a movie ticket or a token to the ski-ball game on the boardwalk.
Use-case example - this key "unlocks" a channel in a Telegram game.
This work of, umm, art, sold for $760,000.
An artwork example.
Often, NFTs are just good ol' fun.