Educational psychology focuses on the scientific study of human learning, while developmental psychology examines the processes and reasons behind how human beings change over time. Scrutinizing learning processes from both cognitive and behavioral perspectives is the central focus of educational psychology. Understanding variations among individuals in intelligence, motivation, self-regulation, cognitive development, and their contributions to the learning process is facilitated by educational psychology. Quantitative methods, such as measurement and testing, form the foundation of its approach. Its objective is to optimize educational practices covering assessment, instructional design, and classroom management. The primary focus of developmental psychology is elucidating the transformations in feelings, thoughts, and behaviors across the lifespan, with particular attention to cognitive, physical, and socio-emotional development. This book is a compilation of chapters that discuss the most vital concepts and theories in the field of educational and developmental psychology. The topics covered herein deal with the core subject of educational and developmental psychology. This book is an essential guide for both academicians and those who wish to pursue this discipline further.