Immunotherapy is an area of biomedical research that focuses on enhancing or guiding the body's natural defense systems using biological tools especially antibodies. These antibodies are designed to recognize specific markers in the body and help regulate immune responses. In some cases, they signal the immune system to take action, while in others, they help reduce overactive responses. Because antibodies can be precisely engineered to find certain targets, they are useful in managing immune-related conditions and supporting long-term health. New developments, such as bispecific antibodies and conjugated antibody systems, allow for even more accurate and tailored applications. As research advances, antibody-based immunotherapy remains a promising pathway for improving immune support and health monitoring.