Therapeutic antibodies are proteins designed to target specific molecules in the body, often to treat diseases like cancer, autoimmune disorders, and infections. They work by binding to antigens, which are substances that trigger an immune response, helping the body to recognize and eliminate harmful cells or pathogens. These antibodies can be produced using various techniques, including recombinant DNA technology. Some well-known therapeutic antibodies include trastuzumab for breast cancer and adalimumab for rheumatoid arthritis. Their development has significantly advanced modern medicine, providing targeted treatment options with fewer side effects compared to traditional therapies.