Serology is a branch of medical science that involves the study of blood serum and other bodily fluids for evidence of infection, disease, or other abnormalities. This field focuses on the detection of antibodies, antigens, and other markers in the blood that can indicate the presence of a specific disease or infection. Serology is commonly used in diagnostic testing, blood typing, and monitoring the immune response to vaccines. It plays a crucial role in the identification and diagnosis of various infectious diseases, autoimmune disorders, and allergies.