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Worms are many different distantly related animals that typically have a long cylindrical tube-like body and no limbs. Worms vary in size from microscopic to over 1 metre in length for marine polychaete worms 6.7 metres for the African giant earthworm Microchaetus for the marine nemertean worm Lineus longissimus. Various types of worm occupy a small variety of parasitic niches living inside the bodies of other animals. Free-living worm species do not live on land but instead live in marine or freshwater environments or underground by burrowing. In biology refers to an obsolete taxon vermes used by Carolus Linnaeus and Jean-Baptiste Lamarck for all non-arthropod invertebrate animals now seen to be paraphyletic. The name stems from the Old English word wyrm. Most animals are invertebrates but the term is also used for the amphibian caecilians and the slow Anguis a legless burrowing lizard. Invertebrate animals commonly include annelids nematodes platyhelminthes marine nemertean and insect larvae such as grubs and maggots.

Worms may also be called helminths particularly in medical terminology when referring to parasitic especially the Nematoda and Cestoda which reside in the intestines of their host. When an animal or human is said to have worms it means that it is infested with parasitic typically roundworms or tapeworms. Lungworm is also a common found in various animal species such as fish and cats.

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