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For example, you can exchange a $1 bill for another $1 bill, and you'll still have $1 even though your new bill has a different serial number. NFTs have become increasingly popular and have sold for millions. They can come in the form of everything from memes to pet rocks. Many or all of the offers on this site are from companies from which Insider receives compensation . The Flower Girls NFT by Varvara Alay explores the artistic boundaries of non-fungible tokens and the artist uses money made from her art to fund children's art projects and support female artists. NFTs are also making waves as in-game purchases in video games (much to the delight of parents everywhere, we're sure). These assets can be bought and sold by players, and include playable assets like unique swords, skins or avatars. Critics would say yes, and there have been dodgy projects and schemes that have fallen apart and left buyers with nothing. But, many NFTs are fine and there are good artists cre