Human parasites are organisms that live on or inside the human body and rely on their host for survival. They can cause various health issues, ranging from mild discomfort to severe diseases. Common types of human parasites include protozoa, helminths (worms), and ectoparasites like lice and fleas. Transmission of these parasites often occurs through contaminated food, water, or direct contact with infected individuals. Prevention methods include practicing good hygiene, cooking food thoroughly, and using insect repellent. Understanding these parasites is essential for maintaining health and preventing infections.