The study of parasites, their hosts and the relationship between them is known as parasitology. It is a biological field that encompasses principles from diverse disciplines such as cell biology, biochemistry, bioinformatics, immunology, evolution, genetics, molecular biology and ecology. Parasitology is sub-divided into various fields. Some of these are medical parasitology, veterinary parasitology, structural parasitology, conservation biology of parasites and parasite ecology. Medical parasitology deals with the parasites that affect humans and the diseases which are caused by them. The study of parasites that infect companion animals and cause economic losses in agriculture is known as veterinary parasitology. Structural parasitology refers to the study of structures of proteins from parasites. This book provides comprehensive insights into the field of parasitology. Some of the diverse topics covered herein address the varied branches that fall under this category. This book will serve as a valuable source of reference for those interested in this field.