What is the purpose of quarantine during the COVID-19 pandemic?

What is the purpose of quarantine during the COVID-19 pandemic?
Quarantine is used to separate someone who might have been exposed to COVID-19 and may develop illness away from other people. Quarantine helps prevent spread of disease that can occur before a person knows they have the virus. CDC recognizes that any quarantine shorter than 14 days balances reduced burden against a small possibility of increasing the spread of the virus.
Full answer in: www.cdc.gov
Who should quarantine during the COVID-19 pandemic
Anyone who has had close contact with someone with COVID-19 should stay home for 14 days after their last exposure to that person. The best way to protect yourself and others is to stay home for 14 days if you think you've been exposed to someone who has COVID-19. Mar 12, 2021
Full answer in: www.cdc.gov