Parasitology is a branch of Biology dealing with parasites and the effects of parasitism. The main objective of Parasitology is the study of parasites, their hosts, the relationship between them and different diseases associated with them. A parasite is an organism that lives in a host and gets its food from or at the expense of its host. Parasites can cause disease in humans. Broadly, the parasite are belongs to Bacteria, Fungi and animal classes such as Protozoa, Helminths and Nematodes.