Developmental psychology is an interdisciplinary field that focuses on the study of human growth, development, and behavior from infancy to old age. It covers various domains, including cognitive, emotional, social, and physical development. There are several synonyms for the term developmental psychology, such as human development, lifespan psychology, and developmental science. Other related terms include child and adolescent psychology, aging and gerontology, neurodevelopmental disorders, and developmental disabilities. These fields all encompass the study of how individuals change over time, and how various factors, such as genetics, environment, and culture, affect their growth and development. Understanding the principles of developmental psychology has essential implications for education, healthcare, and social policy.