Tapeworms are flat, segmented parasites that live in the intestines of various animals, including humans. They belong to the class Cestoda and can grow several meters long. Tapeworms attach themselves to the intestinal wall using hooks or suckers and absorb nutrients from the host's digested food. Infection typically occurs through consuming undercooked meat or contaminated food and water. Symptoms may include abdominal pain, weight loss, and digestive issues, but some people may remain asymptomatic. Treatment usually involves medication that targets the tapeworm, allowing it to be expelled from the body.