It's another type of vaccine. It will prevent you from being infected in most cases, up to 90% of the time, but if you get infected, the infection will be much less serious than if you hadn't received it. The number of people who have experienced serious problems with the vax is extremely small, despite what the anti-vaxers claim.
If you live in a society with other human beings, there might be mandates that you need to comply with under certain conditions, for public safety reasons. If you refuse to comply, then you pay the price. That's how it is when one is a member of a community comprised of human beings. Perhaps if one moves to Antarctica, and lives with the penguins, there would be different rules.