The work of entomologists, the people who study insects is extremely diverse due to the high abundance, species richness, and ecological and behavioral characteristics of insects. This book is intended as an introduction to the study of entomology, giving brief explanations and definitions of some chosen topics such as Introduction, Insect Morphology and Physiology, Classification of Insects, Insect Behaviour, Parasitism by Insects, Mites and Ticks, From Solitary to Social, Embryogenesis and Morphogenesis of Insects, Important Orders and Families of Agricultural Pests and Economic Importance of Insects, Predatation by Insects, Defoliating Insects, SapSucking Insects, Gall Formers, and Mites, Bud, Shoot, Branch, and Terminal Insects, Insect Color Pigments, Apiculture and Meliponiculture, Entomophagy, Household Pests. A helpful glossary explains the technical terms of insect anatomy. Finally the book ends with a useful glossary of technical terms. Graduating students, researchers and teachers desirous of updating the information on different aspects of microbial plant pathogens and the diseases caused by them, will find this book to be useful.