Educational psychology is the study of how humans learn in regulatory education, the effectiveness of educational interventions, teaching psychology, and the social psychology of schools as organizations. Educational psychology deals with how students learn and develop, and often focuses on subgroups such as gifted children and those who are subject to special disabilities.
Understanding educational psychology is a discipline of psychology that investigates the psychological problems that occur in the world of education. Meanwhile, according to the American Encyclopedia, the definition of educational psychology is a more principled science in the teaching process involved with the discoveries and applying the principles and ways to improve the efficiency in education.
From some opinions on educational psychology, I conclude that Understanding Educational Psychology is the study of human behavior in the world of education which includes systematic study of processes and factors related to human education whose purpose is to develop and improve the efficiency in education.