A simple standard for digital assets on EOSIO blockchains: Non-Fungible Tokens (NFTs), Fungible Tokens (FTs), and Non-Transferable Tokens (NTTs).
There are several reasons why you may want to use a digital asset standard:
A lot of functionality is already developed, and edge cases worked out, saving hundreds of hours of work.
So that users can express their ownership of digital assets in a decentralized way, even outside the control of the Dapp that created them.
So that a user’s assets show up in third party asset explorers and can be traded in third party asset marketplaces.