Here's a breakdown:
* Parasite: An organism that lives in or on another organism (the host) and benefits by deriving nutrients at the host's expense.
* Host: The organism that is being used by the parasite.
Examples of parasites:
* Fleas on dogs
* Tapeworms in humans
* Ticks on deer
It's important to note that "parasite" can also be used more broadly to describe any organism that benefits at the expense of another, including:
* Predators: Animals that hunt and kill other animals for food.
* Scavengers: Animals that feed on dead animals.
However, the term parasite is most commonly used for organisms that live in close association with their host and rely on them for survival.