Human Development Theories are frameworks that explain how individuals grow and change throughout their lives. These theories explore various aspects of development, including physical, cognitive, and emotional growth. Notable theorists include Jean Piaget, who focused on cognitive development, and Erik Erikson, who emphasized psychosocial stages. These theories help us understand the different phases of life, from infancy to adulthood, and the factors that influence development. They consider the roles of genetics, environment, and culture, providing insights into how people learn, form relationships, and adapt to their surroundings.