Parts of a larger department in an organization or government.
Subdepartments help the larger department to work better by focusing on specific tasks.
Examples:
The finance subdepartment handles money.
There are many subdepartments in the big company.
The subdepartments work together to make the whole department better.
The subdepartments are like little teams inside the big team.
The subdepartments each have their own job to do.
The subdepartments help the big department to do its work.