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Hello, this is Six Minute English from BBC Learning English.
I'm Neil.
And I'm Sam.
People collect all kinds of things for a hobby,
from stamps and coins to comics and football stickers.
Do you collect anything, Sam?
I used to have a big collection of Pokémon cards,
but I have no idea where they are now.
Well, maybe you should start looking for them,
because all kinds of collectibles,
that's objects that people want to collect,
are selling for big money on the internet.
It's all part of a new tech craze called non-fungible tokens,
or NFTs, for short.
Non-fungible tokens?
Basically, NFTs are unique,
one-of-a-kind items that can be bought and sold like any physical object,
but only exist in the digital world.