Study of parasites, their hosts and the relationship between the host and parasites is called parasitology. As a field of study it draws techniques from interdisciplinary disciplines like cell biology, bioinformatics, molecular biology, immunology, etc. This book is a compilation of chapters that discuss the most vital concepts and emerging trends in the field of parasitology. The text covers not only the vital components of parasitology but it also presents an integrated approach to study the varied aspects of this discipline. It aims to present to its readers multiple fields that are integrative in nature for example medical parasitology, veterinary parasitology, parasite ecology, etc. As this field is emerging at a rapid pace, the contents of this book will help the readers understand the modern concepts and applications of the subject.