This document provides an overview of sociocultural theory (SCT) perspectives on second language acquisition (SLA). Key points of SCT include: language learning occurs through social interactions; the zone of proximal development explains how learners internalize new structures with assistance; and internalization is how learners move from other-regulation to self-regulation. SCT views language as a cultural tool that mediates thinking. Methodologies like the genetic and microgenetic methods examine language development over time in social contexts. SCT challenges notions of universal acquisition orders and sequences.