Parasites are classified as organisms that take advantage of another organism (host) for its necessities such as food. This relationship is non-mutual and the host is mostly unaware of the parasite.
There are different ways that a parasite interacts with the host. Some parasites burrow into the host to lay its eggs in it (the host becomes the food source for the emerging larvae) or as a food source for itself.
Another type of parasite goes one step further. Instead of just passively staying in its host, the parasite affects the behavior and movement of the host. It does this by
taking control of the host's neurological system.
The host basically becomes a mindless zombie under the control of the parasite.
