Developmental psychologists study how people grow and change throughout their lives. They focus on various aspects of development, including cognitive, emotional, social, and physical changes. By examining different stages, from infancy to old age, they aim to understand how individuals develop skills, behaviors, and personalities. These psychologists often conduct research and use observations to identify patterns in development. They may work in various settings, such as schools, hospitals, or research institutions, and their findings can help inform practices in education, parenting, and mental health. Their work contributes to a better understanding of human growth and the factors that influence it.