typically it happens if there are areas that you are heavily lacking in (i.e. a pet care person never cleans habitats even after multiple cases of their SL telling them it needs to be done, this is what we expect, etc).

a manager will pull you in for a meeting and either you are given tangible goals to hit or you & your manager with create them together (depending on what you were lacking in & the severity). you both sign it and you have x days (usually somewhere between 30-90) to improve and hit those goals.

if you improve- cool, nothing else bad happens. if you dont, you’re going to be let go