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.
Governance Token
Developers design governance tokens to let token holders influence the direction of a protocol.
Coin
Cryptocurrencies known as coins run on separate blockchains and are unrelated to other coins. Such a cryptocurrency's single unit is also known as a coin.
Testnet
An alternative blockchain used by developers for testing.