Infectious Mononucleosis is a disease caused by Epstein-Barr virus (EBV) that commonly affects children and young people, characterized by symptoms such as fever, swollen liver and spleen, weakness, and sore throat. The virus remains in the body fluids after infection and can be transmitted through direct contact with saliva. Although self-limiting, the disease requires medical attention to prevent complications like splenic rupture. Treatment typically involves supportive care and medication to reduce pain and discomfort.