An NFT is a unique unit of data that can be used to certify ownership of a digital asset. NFTs are created using blockchain technology - typically the Ethereum blockchain - and can represent any digital object, including photos, artwork, memes, music, digital collectibles, and even tweets.
There are many marketplaces for NFTs, where sellers offer either an auction or an option to buy immediately. The novelty of NFTs compared to "physical" art objects is that digital assets can theoretically be reproduced and/or downloaded an unlimited number of times, thus "owned" by anyone.
The idea behind NFTs is therefore to determine, among the many copies, which is the original, and to whom it belongs.
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