Erik Erikson's psychosocial development theory is a framework that outlines eight stages of human development, each characterized by a specific conflict that individuals must resolve. These stages span from infancy to late adulthood, emphasizing the impact of social relationships and experiences on personality and behavior. Successful resolution of each conflict leads to a healthier personality and stronger social skills. Each stage, such as trust vs. mistrust in infancy or integrity vs. despair in old age, represents a critical period where individuals face challenges that shape their identity. Erikson believed that these psychosocial conflicts are essential for personal growth and development throughout life.