It's unfortunate that they did not just say "changed jobs" in the title. However, as someone who doesn't know how employees leaving is handled by the HR, can s

It's unfortunate that they did not just say "changed jobs" in the title. However, as someone who doesn't know how employees leaving is handled by the HR, can someone tell me what happens when an employee leaves or joins? Does the company report it to the government, if so which branch of the government and why? Also how quickly after an employee leaves will the reporting to the government happen?