Parasitology is a branch of microbiology that deals with the study of parasites, which are organisms that live off another organism for survival. There are several synonyms for parasitology including parasitobiology, parasitology and pathology, helminthology, entomology, and protozoology. Parasitobiology is the study of parasites and their relationship with their host organism. Pathology is the study of the causes and effects of diseases, including those caused by parasites. Helminthology is the study of parasitic worms, while entomology is the study of insects and their relationship with their host. Protozoology is the study of single-celled organisms that can cause diseases in animals and humans. Whether it is referred to as parasitology or any of its synonyms, this branch of science plays a significant role in our understanding of parasites and how they affect us.