Entomology is that branch of zoology which deals with the study of insects. It studies the structure, classification, biological systems, nature, habitats, etc. of insects in detail. This book attempts to understand the multiple topics that fall under the discipline of entomology and how such concepts have practical applications and effects in the ecosystem. It picks up individual branches and explains their need and contribution in the context of the growth of this area. The textbook also explains the various practices that highlight the conservation of the environment. Coherent flow of topics, student-friendly language and extensive use of examples make this text an invaluable source of knowledge.