Development and educational psychology is a branch of psychology that studies the process of human development and learning, aiming at exploring the changes of human cognition, emotion, society and behavior at various stages, and the influence of education on these changes. The research in this field mainly focuses on the development process of children and adolescents, the development of learning strategies and skills, the influence of educational environment on learning, and the interaction between teachers and students. The theory and practice of developmental and educational psychology can be applied to the field of education and training to help educators understand the psychological and behavioral characteristics of learners and formulate more effective educational strategies and programs.