What is the advantage of getting a vaccine over getting antibodies?

As I understand it, a vaccine is a weakened form of a disease that gets the body’s immune system to produce antibodies. There is talk about using antibodies from people who have had the corona virus. Why is this not as effective as the antibodies from a vaccine? Is the difference between the two that the vaccine gets the body to make its own antibodies while just using someone else’s antibodies means that they will eventually run out?