This book provides comprehensive insights into the field of photochemistry. It elucidates the various concepts and theories related to this area. Photochemistry is the study of the chemical effects of light. This process is of significant importance as it enables photosynthesis in plants, helps in production of vitamin D and also, is crucial for vision. This book outlines the fundamental processes and applications of photochemistry in detail. It presents the complex subject of photochemistry in the most comprehensible and easy to understand language. The topics included in it are of utmost significance and are bound to provide incredible insights to readers. The textbook is appropriate for those seeking detailed information in this area.