Perhaps the most famous use case for NFTs is that of cryptokitties. Launched in November 2017, cryptokitties are digital representations of cats with unique identifications on Ethereum’s blockchain. Each kitty is unique and has a different price. They "reproduce" among themselves and create new offspring with other attributes and valuations compared to their "parents."
Within a few short weeks of their launch, cryptokitties racked up a fan base that spent $20 million worth of ether to purchase, feed, and nurture them. Some enthusiasts even spent upward of $100,000 on the effort.
More recently, the Bored Ape Yacht Club has garnered controversial attention for its high prices, celebrity following, and high-profile thefts of some of its 10,000 NFTs.
Much of the earlier market for NFTs was centered around digital art and collectibles, but it has evolved into much more. For instance, the popular NFT marketplace OpenSea has several NFT categories