Demam Berdarah Dengue (DBD) is a disease caused by the Dengue virus transmitted through the bites of infected Aedes Aegypti mosquitoes. The document discusses the symptoms of Dengue fever including fever, headaches, muscle and joint pains. It describes the lifecycle of the Aedes Aegypti mosquito and emphasizes the importance of preventing stagnant water where mosquitoes can breed to control the spread of the disease. Prevention methods are key to controlling Dengue fever.