Which of the following correctly describes antibodies?

Antibodies are specialized proteins produced by the immune system that play a crucial role in identifying and neutralizing foreign substances, such as pathogens (bacteria and viruses). They are designed to bind specifically to antigens, which are unique molecules found on the surface of pathogens. This binding helps to mark these pathogens for destruction by other immune cells or to neutralize their harmful effects directly.

Antibodies are part of a larger class of proteins known as immunoglobulins, which are vital components of the adaptive immune response. They help to target and eliminate invaders, thereby protecting the body from infections and diseases. This function is central to the body's ability to defend itself against various threats, making the understanding of antibodies essential in both biology and medicine.