What does imperative mood mean in grammar?
It is a mood used to give orders or commands. See explanation.
Imperative mood is a form used to give someone orders or commands.
Let's compare 2 sentences:
- I open the window.
- Open the window
First sentence only informs what a person does. It is a sentence in indicative mood - it indicates action done.
The second sentence could be used to ask someone to do something (here open the window) or to give someone an order to do so. It is in the imperative mood