The mood used to give commands, requests, or instructions.
In German, the imperative form varies depending on whether the command is informal or formal, and whether it's directed at one person or more.
Examples
Informal (singular):
Geh nach Hause!
Go home!
Informal (plural):
Geht nach Hause!
Go home!
Formal:
Gehen Sie nach Hause!
Go home!