The department within a business responsible for the progression of the company through people management. Usually hated by employees at lower levels due to managers passing on their dirty work i.e disciplinaries, firing and redundancies.
Manaer to employee:
Don't worry Jack, I'm the best manager in the world and I'll make sure you won't lose your job.
Manager to Human Resources Rep:
This Jack guy is a liabilaty. I need to get rid of him, will you dismiss him for me.
Jack to his friends:
My manager was great. He did everything he could to save my job but HR fired me. Fucking pricks!