The AIDS epidemic refers to the widespread occurrence of Acquired Immunodeficiency Syndrome (AIDS), a disease caused by the Human Immunodeficiency Virus (HIV). This virus attacks the immune system, making it difficult for the body to fight off infections and diseases. The epidemic began in the late 20th century, particularly affecting certain populations, and has led to millions of deaths worldwide. Efforts to combat the AIDS epidemic include education, prevention strategies, and the development of antiretroviral therapies. Organizations like the World Health Organization and UNAIDS work to provide resources and support for affected individuals. Despite significant progress, the epidemic continues to pose public health challenges globally.