Cross-chain NFT Marketplace development involves building a decentralized marketplace that enables the buying, selling, and trading of NFTs across multiple blockchain networks. This is achieved by using technologies such as Atomic Swaps or the Interledger Protocol (ILP) to allow seamless NFT transfers between different blockchains. By eliminating the need for centralized exchanges, cross-chain NFT marketplaces enhance the security and trust of buyers and sellers. However, developing such a marketplace requires expertise in NFTs and blockchain technology, as well as experience in creating decentralized applications.