Rubella, or German measles, is an acute viral disease characterized by a maculo-papular rash, low-grade fever, and lymphadenopathy, primarily caused by the rubella virus transmitted through droplet spread. Most cases are asymptomatic, and complications may include arthralgia, encephalitis, and congenital malformations if contracted during pregnancy. Prevention through vaccination is essential, with the rubella vaccine available as a single or combination vaccine, while symptomatic treatment includes pain relief and cold compresses.