Antigen is a substance that can stimulate the immune system or the immune system to produce antibodies as resistance, which is a form of body protection against antigens. Bacteria, viruses, and other harmful substances such as chemicals, are classified as antigens for the human body. The immune system considers antigens as foreign substances that can threaten our body. Antigens generally come from outside the body through food, drinks, dirt, dust, and various things in the surrounding environment. In addition, antigens are also found in tissues and cells in the body, including cancer cells. Relationship of Antigens and Antibodies As explained above, antibodies are part of the immune system that acts as a bulwark to protect the body from the threat of viruses, bacteria, germs, and substances that cause infection and disease. Antibodies will be produced by the immune system according to the amount of antigen. Antibodies have a specific form of antigen to be opposed. It is intended