Japanese encephalitis is a viral illness transmitted by mosquitoes. It is caused by the Japanese encephalitis virus, which is part of the Flaviviridae family. This disease ranks as the most prevalent vaccine-preventable encephalitis in Asia, notably in rural and agricultural zones where rice fields and pig farms offer ideal conditions for the Culex mosquito, the vector responsible for transmission. Japanese encephalitis predominantly impacts children, potentially causing significant neurological complications such as seizures, paralysis, and difficulties with cognitive functions. Severe instances have a high rate of mortality. While the majority of infections are asymptomatic, approximately 1 in 250 individuals experiences acute encephalitis. Efforts in vaccination, controlling vectors, and public health initiatives contribute to the prevention of Japanese encephalitis. Despite the presence of effective vaccines, the disease continues to be a significant public health concern in the regions it affects.