As of the end of 2022, the largest NFT marketplace is OpenSea. OpenSea is the largest and most popular NFT marketplace, with a vast collection of NFTs across various categories, including art, collectibles, and more. It has a large and active community of buyers and sellers. It is known for its user-friendly interface and wide range of features and tools for creators and collectors. OpenSea's platform is decentralized and built on the Ethereum blockchain, providing security and transparency for NFT transactions.