Malaria is a life-threatening disease spread by Anopheles mosquitoes carrying the Plasmodium parasite, with symptoms appearing 8-25 days after infection. The most common species causing malaria is Plasmodium falciparum, which accounts for 75% of cases, particularly affecting children under 15 and pregnant women. Prevention methods include medication, mosquito elimination, and using insecticide-treated nets, while treatment options vary based on the type and severity of the disease.