There are two main types of parasites:
* Ectoparasites: These live on the outside of their host, like fleas, ticks, and lice.
* Endoparasites: These live inside the host, like tapeworms, roundworms, and some bacteria.
It's important to note that parasitism is a type of symbiotic relationship, where one organism (the parasite) benefits at the expense of the other (the host).