Biological therapy, also known as biotherapy or biologic therapy, is a type of treatment that uses substances derived from living organisms, such as cells, tissues, or antibodies, to treat diseases. These substances are designed to target specific molecules or pathways involved in the disease process, and can be used to stimulate the immune system, block abnormal cell growth, or deliver targeted therapies directly to diseased cells. Biological therapy is commonly used in the treatment of cancer, autoimmune diseases, and inflammatory conditions, and has shown promising results in improving patient outcomes and reducing side effects compared to traditional treatments. Examples of biological therapies include monoclonal antibodies, cytokines, and gene therapies. Overall, biological therapy represents a cutting-edge approach to treating a wide range of diseases by harnessing the body's own natural defenses and targeting the underlying causes of disease at a molecular level.