NFT marketplaces are platforms where non-fungible tokens (NFTs) are traded, stored, and minted, serving as a bridge between blockchain technology and content creators. Popular blockchain platforms for these marketplaces include Ethereum, Tezos, and Flow, with notable marketplaces like OpenSea, Crypto.com, and Nifty Gateway facilitating NFT transactions. Users typically need a compatible crypto wallet and cryptocurrency, such as Ethereum, to engage in buying and selling NFTs.