Keep means to have or hold something without losing it. You keep things safe or with you.
I keep my keys in my bag.
She keeps water in a bottle.
Keep can mean to care for or guard people, animals, or things to keep them safe.
She keeps her little brother safe at home.
Farmers keep animals on their farms.
Keep can also mean to save information or data in computers or paper.
Keep your files on the computer.
Please keep a copy of the report.
Keep can mean to stop yourself from showing feelings or saying things.
Try to keep your anger inside.
She kept silent during the meeting.
Keep is a noun meaning the main strong tower of a castle where people live and defend.
The king lived in the castle keep.
The soldiers defended the keep from enemies.
