The beef tapeworm, scientifically known as *Taenia saginata*, is a parasitic worm that can infect humans who consume undercooked or raw beef. This flat, ribbon-like worm can grow up to 25 meters long and lives in the intestines, where it absorbs nutrients from the host's food. Infection with the beef tapeworm can lead to a condition called taeniasis, which may cause mild symptoms like abdominal pain or nausea. To prevent infection, it's essential to cook beef thoroughly and practice good hygiene. If someone suspects they have a tapeworm, they should consult a healthcare professional for diagnosis and treatment.