It prevents you from contracting COVID-19, or from becoming seriously ill or dying from COVID-19, and also preventing you from transmitting COVID-19 to others. It increases the number of members of the community who are immune from contracting COVID-19 – slowing the spread of the disease and contributing to herd immunity, as well as preventing The COVID-19 virus from spreading and replicateing, these two processes allow it to mutate which could grant it the ability to resist the vaccines.