In order to confirm the identity of the person entering an account, a verification code is given to a different device. It's used for two-factor authentication.
DeFi
a movement promoting substitutes for conventional, centralized financial services.
Mainnet
A mainnet is a separate blockchain that operates on its own network using its own protocol and technologies.
Altcoin
Altcoin is the term given to describe alternative digital assets, such as a coin or token that is not Bitcoin. This nomenclature comes from the idea that Bitcoin is the original cryptocurrency and that all others are then considered “alternate” or “alternative” coins.