Enterobius vermicularis, commonly known as the pinworm, is a small parasitic worm that primarily infects humans, especially children. It is about 8 to 13 millimeters long and has a distinctive pointed tail. The infection occurs when eggs are ingested, often through contaminated hands or surfaces, leading to symptoms like itching around the anus. The life cycle of Enterobius vermicularis involves the female laying eggs in the perianal area at night. These eggs can survive on surfaces for several weeks, making transmission easy. Treatment typically involves medication to eliminate the worms and good hygiene practices to prevent reinfection.