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.
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.
In blockchain, an address refers to a unique alphanumeric identifier associated with a digital wallet or account that is used to send, receive, and store cryptocurrencies or other digital assets.
Active management in crypto refers to an investment strategy where portfolio managers actively make buying and selling decisions to try to outperform the market and generate higher returns.