Antibody-mediated immunity, also known as humoral immunity, is a crucial part of the immune system that involves the production of antibodies by B cells. When the body encounters a pathogen, these specialized cells recognize it and produce antibodies that specifically target and neutralize the invader, such as bacteria or viruses. Once the antibodies bind to the pathogen, they can mark it for destruction by other immune cells or prevent it from entering healthy cells. This process not only helps eliminate the current infection but also creates memory B cells, which provide long-lasting protection against future infections by the same pathogen.