Recording an NFT onto Ethereum or other blockchain. The NFT, which certifies ownership, resides on the blockchain, but the actual NFT image is stored on IPFS or some other storage system. See
IPFS.
Lazy Minting
NFT collections can number in the hundreds and thousands of units, which makes paying the fees of all the NFTs up front prohibitive. With regular NFT minting, creators pay a fee to list their NFTs on the blockchain. In contrast, "lazy minting" means listing their NFTs for free, and when the NFT is purchased, the fee is paid by the seller or in some cases by the buyer.
For example, when NFT creators lazy mint images on the OpenSea marketplace, they are stored in Pinata file storage and can be edited until sold. After the sale, the NFT is permanently recorded on the blockchain. See
crypto minting and
crypto glossary.