A semi-fungible token (SFT) has the properties of both fungible and non-fungible tokens. It remains fungible until it is used for a specific purpose.
An NFT, or non-fungible token, is a 1-of-1 digital asset you can sell and trade on the open market. An SFT on the other side has the same attributes and utility as an NFT but can be minted in quantities >1. SFTs have lower minting fees because they are more resource-efficient on-chain.