Confidence votes 108. An antibody is a protein that your body produces which binds to the surface of a foreign body, like a bacteria or virus, and prevents it from actively damaging your body.Antibodies, generally bind other proteins, and they will bind to specific portions of the proteins. Answer   An antibody is what your body produces to fight of disease and infection. When a person has an autoimmune disease, the body's antibodies are attacking hea … lthy and normal cells. 3 people found this useful.