Immunology is a discipline of biology and medicine that studies immune systems in all living things. The immune system is the body's defence system against any condition or disease. It is made up of white blood cells as well as antibodies. They attack any foreign entity that enters the body and causes disease, such as bacteria, fungus, viruses, and protozoans. Every science has two sides to it: theoretical and practical/applicable. What is theoretically possible does not always provide the expected consequences in practise. As a result, scientists devise a strategy for coping with real-world issues. This branch of science is known as applied science (Science as applied to practice). Applied Immunology is a branch of science that works with practical applications of immunology or deals directly or indirectly with the immune system. Applied immunology helps with the development of biological treatments such as monoclonal antibodies, vaccines, and diagnostics. The field of applied immunology is a subset of immunology. It takes these findings and narrows them down to specific topics with the goal of improving disease outcomes or preventing disease.