Parasitology aims to analyse and identify the parasites and diagnose the diseases caused by parasites. Parasites use other species of plants and animals as hosts. Parasitology is a diverse field as the parasitic lifecycle is been very active and successful in the history of life on earth. Parasitism comprises an ecological relationship between two individuals of different species where the parasite’s environment is another living organism. Parasites and hosts are locked into a continuous struggle for survival, and understanding the mechanisms that each side in this battle use to gain advantage challenges parasitologists to understand biological phenomena at the cutting edge of a wide variety of scientific disciplines.