Parasite

A parasite is an organism that lives in or on a host and obtains resources from it, typically harming the host without immediately killing it.

Host–parasite interaction: The ecological relationship in which a parasite gains resources from a host, usually imposing a cost. This interaction defines how resource extraction and host harm shape parasitic life.
Host: An organism that provides resources or habitat to another organism, including a parasite. A parasite’s ecology and reproduction depend on the organism it exploits.
Parasitology: The scientific study of parasites, their hosts, and the relationships between them. This field investigates parasite diversity, life cycles, and effects on hosts.
Plasmodium: A genus of single-celled parasites that cause malaria and develop in humans and mosquitoes. Its two-host life cycle illustrates how parasites can depend on vectors.
Parasitic life cycle: The sequence of developmental stages and hosts through which a parasite reproduces and spreads. Many parasites depend on several hosts or environments to complete development.
Symbiosis: A close, persistent association between organisms of different species. Parasitism is one kind of long-term interspecific association.
Parasitic disease: An illness caused by a parasite living in or on a host. Human and animal infections are a major practical consequence of parasitism.
Taenia solium: A tapeworm species whose larvae can infect human tissues and cause cysticercosis. Its different larval and adult stages produce distinct infections in humans.
Host manipulation: A parasite-induced change in host behavior or physiology that benefits the parasite. Some parasites alter host behavior to improve transmission to their next host.
Mutualism: An interaction between species in which both participants benefit. It contrasts with parasitism, where the host bears a cost.

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