Provide a brief overview of Vygotsky's theory.

Vygotsky's theory suggests that cognitive development occurs when learners, with the support of more knowledgeable others (MKO) -usually parents, teachers, or other adults- acquire the knowledge and skills unique to a particular culture through the use of social interaction and language. Adults and other MKOs gauge learner's readiness for new tasks and provide the support needed to acquire more developmentally advanced knowledge and skills through language-rich social interactions.