Binding to antigens coating the surface of the invader to keep pathogens from ruining healthy body cells and stimulating other parts of the immune system to eliminate pathogens are ways antibodies function. Another way antibodies function is using opsonization so pathogens can be identified and neutralized by other immune cells.
An antibody, also known as immunoglobulin, is a large Y-shaped protein produced by the immune system to identify and offset foreign objects and pathogens, including viruses, toxins, bacteria and parasites. An antibody is created by white blood cells called B-lymphocytes, also known as B-cells. Humans can generate 10 billion kinds of antibodies, and each antibody protects the body against a certain type of antigen.