Sociocultural theory, based on the work of Lev Vygotsky, emphasizes the role of social interaction, the more knowledgeable other, and the zone of proximal development (ZPD) in learning. The ZPD is defined as the space where sensitive instruction can significantly enhance a child's development with guidance from peers or adults. Key educational practices include scaffolding, reciprocal teaching, and leveraging family and community resources to support student learning.