The COVID-19 vaccines help protect people in these ways:
They can greatly reduce your chance of getting seriously ill, even if you get COVID-19
Completing the vaccine series reduces your chances of hospitalization and lowers your risk of dying from COVID-19
They are highly effective at preventing COVID-19
They add to the number of people in the community who are protected from getting COVID-19 — making it harder for the disease to spread
https://www.doh.wa.gov/Emergencies/COVID19/VaccineInformation/HowVaccinesWork#heading62095