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Non-fungible tokens (NFT) are a unique immutable unit of data stored on a digital ledger. An NFT marketplace is a place where you can trade your NFTs at ease. The worldwide turnover of NFT is around $338.04 million. The market cap was increased and reached tenfold between 2018 and 2020. NFT marketplaces will become more popular in the future in the crypto space. The most popular and career-defining marketplace is Open Sea, and people use this as an example.