An NFT marketplace is a digital platform where non-fungible tokens (NFTs) can be bought, sold, and traded. NFTs are unique tokens recorded in a blockchain that represent ownership of a digital or physical asset. NFT marketplaces are similar to Amazon or eBay, but instead of goods, they deal with NFTs. There are many NFT marketplaces available, each with its own niche and reputation. Some marketplaces are self-service or non-curated, meaning they are open to everyone who registers to buy or sell their NFTs. Others are curated, meaning they have a selection process for the NFTs they list. Niche marketplaces center around a particular asset or theme, such as music, art, sports, gaming, or real estate.

To use an NFT marketplace, you will need to set up a crypto wallet to store and trade your NFT tokens. Most NFT marketplaces have a "Create" button that will take you to the page where you can begin minting your NFTs. Listing and creating NFTs on a marketplace platform incurs a blockchain network fee, which varies depending on which blockchain-based system you decide to use. Ethereum is the most popular blockchain for NFTs, but it has the most expensive fees.

If you want to create your own NFT marketplace, you will need to conceptualize the platform and make it simple to store and sell NFTs. You will also need to provide content management, automated generation of sales reports, and live chat support for users. It is recommended to create a multi-chain NFT marketplace integrated with several blockchain networks and various digital wallets.

Some popular NFT marketplaces include OpenSea, Rarible, Nifty Gateway, and SuperRare. Each marketplace has its own system for how it operates, and the types of NFTs available, fees, payment options, permitted blockchains, and other rules will depend on which one you use.