Hookworms are parasitic worms that live in the intestines of humans and animals. They attach to the intestinal wall and feed on blood, which can lead to anemia and other health issues. The most common species affecting humans are Ancylostoma duodenale and Necator americanus. These worms are typically transmitted through contaminated soil, where their larvae can penetrate the skin, often through bare feet. Hookworm infections are more prevalent in tropical and subtropical regions, particularly in areas with poor sanitation and hygiene practices. Treatment usually involves antiparasitic medications to eliminate the worms from the body.