The word 'does' is a form of the verb 'do' that is used with 'he', 'she', or 'it' as the subject. It shows that someone is doing something right now or regularly.
When someone uses 'does', it usually means they are talking about someone doing something at the moment or as a habit.
Examples:
He does his homework every day.
She does a great job at work.
It does not rain in the desert very often.
The cat does not like water.
He does a backflip every morning.
She does her best in everything she tries.