Developmental stages refer to the distinct phases of growth and change that individuals experience throughout their lives. These stages are often categorized into periods such as infancy, childhood, adolescence, and adulthood. Each stage is characterized by specific physical, cognitive, and emotional developments that influence a person's abilities and behaviors. Understanding these stages is essential for various fields, including psychology and education. For example, Jean Piaget identified stages of cognitive development that explain how children learn and think differently as they grow. Recognizing these stages helps caregivers and educators support individuals effectively during their unique developmental journeys.