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What is parasitism?

Parasitism is an inharmonious interspecific ecological interaction in which individuals of a species (the parasites) explore organs, tissues or cells of individuals of another species (the hosts) causing harm to these last ones.

What is the difference between ectoparasite and endoparasite?

Ectoparasites are parasites that explore the external surface of the host (like, for example, mites that parasite the skin). Endoparasites are parasites that live within the body of the host (like the taenias).

Concerning the number of hosts how are parasites classified?

Parasites that require only one host are called monoxenous parasites. Parasites that need more than one host for their life cycle are called heteroxenous parasites.