Developmental science is the study of how and why individuals change over time. This interdisciplinary field draws on psychology, biology, sociology, and other disciplines to understand various aspects of human development, including physical, cognitive, emotional, and social changes from birth to old age. Researchers in this area focus on studying the factors that influence development, such as genetics, environment, and culture, and how these factors interact to shape individuals' growth and maturation. Developmental science aims to provide insights into human behavior, relationships, and functioning across the lifespan.