This presentation provides an in-depth exploration of Lev Semyonovich Vygotsky's seminal contributions to the fields of developmental psychology and education. It meticulously examines his sociocultural theory, emphasizing the role of social interaction and cultural tools in cognitive development. The analysis focuses on key concepts such as the Zone of Proximal Development (ZPD), scaffolding, and the interplay between language and thought. By dissecting Vygotsky's core ideas, the presentation aims to offer a holistic understanding of his lasting impact.