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
Motion and sound example - click to open, then click the play button
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.

Fun example