Constructivism is a theory of learning that suggests individuals construct knowledge and meaning from their experiences. Key aspects of constructivism include problem solving, hands-on experimentation, concept development through logical reasoning, and authentic, engaged learning. Constructivism informs teaching approaches that involve scaffolding learning experiences and allowing students to construct their own understandings through exploration and discovery rather than direct instruction. Major theorists who contributed to constructivism include Piaget, Vygotsky, and Dewey.