Monoclonal antibodies are laboratory-produced molecules that are designed to mimic the immune system's ability to fight off harmful pathogens, such as viruses or cancer cells. These antibodies are produced by cloning a single immune cell to create identical copies that target a specific antigen, or foreign substance, in the body. Monoclonal antibodies have been utilized in a variety of medical treatments, including cancer therapy, autoimmune diseases, and infectious diseases. Their specificity and ability to target specific molecules make them powerful tools in precision medicine and personalized therapy.