This document discusses the application of educational psychology in teaching and learning. It defines educational psychology as the branch of psychology that focuses on understanding the processes of teaching and learning in educational settings. It explains that teaching and learning are closely related and can be divided into three levels: the memory level involving thoughtless teaching, the understanding level involving thoughtful teaching, and the reflective level involving the most thoughtful teaching requiring higher cognitive abilities. The document also lists several ways educational psychology can be applied by teachers, such as knowing the learner, providing guidance and counseling, using proper teaching methods, and improving communication skills. Finally, it provides brief descriptions of some influential psychologists who contributed to the field of educational psychology.