It’s embarrassing that you don’t understand how vaccines work and you’re a grown adult. Forget Covid, this is basic science and health education.
Vaccines ensure your body has the antibodies you need to fight infections. They principally guard against serious illness and death, making your symptoms less severe (good) and often less likely to pass it on (good).
I wouldn’t have been so blunt if you weren’t trying to comment on something you know nothing during a time when you’ve made NO effort to educate yourself. You’re on the internet - you could have done that.