In this paper I will talk about the theories of human development as yielded by Jean Piaget and Sigmund Freud, two of the most compelling analysts of the twentieth century. Advancement depicts the development of people all through their life expectancy, from origination to death. Individuals experience numerous progressions through the span of their lives. Freud was the father of psychoanalysis, a multi-perspective investigation covering the examination of human personality and the association and elements of identity advancement, strategies for treating psychological maladjustment, and a hypothesis that clarifies human conduct. He trusted that identity advancement was fundamentally roused by natural drives and primordial senses alongside ecological impacts. He contended that individuals’ mental issues were established in uncertain issues of adolescence, as in youth encounters in the past generally decide human identity in its later stages. Piaget was one of the spearheading figures of the developmental psychology whose work on hereditary epistemology tried to follow the nature and birthplace of learning from tangible engine activities in outset to formal cognizance and sensible tasks in adulthood. Truth be told; hereditary and formative were equivalent words in his speech. He built up the psychological hypothesis of human advancement, a hypothesis that has turned into the foundation in understanding the development of youth mental procedures. He trusted that the learning procedure is impacted by both inborn and extraneous components, at the end of the day, youngsters’ astuteness principally created through collaboration with their condition. Psychologist endeavors to comprehend how individuals change all through life.