It's called a severance package. The company isn't giving you money to quit - you're working at-will and they can terminate your employment at any time for any reason. The amount is usually equivalent to a few months worth of paychecks.
What they pay you for is you signing away your ability to sue for wrongful termination. Because they can't really fire you for any reason.
What they pay you for is you signing away your ability to sue for wrongful termination. Because they can't really fire you for any reason.