Book excerpt: Behavioral psychology is the scientific study of the behavior exhibited by humans. The behavior is mostly observed in reaction to specific situations. Behavioral psychology integrates principles of philosophy and psychology. This book presents the complex subject of behavioral psychology in the most comprehensible and easy to understand language. From theories to research to practical applications, case studies related to all contemporary topics of relevance to this field have been included herein. It will help the readers in keeping pace with the rapid changes in this field.