Constructivism is a learning theory based on the idea that learning is an active, constructive process where students build new understandings based on current and past knowledge. Key theorists who contributed to constructivism include Piaget, Bruner, Vygotsky, and Dewey. Under constructivism, the teacher acts as a facilitator by providing hands-on activities that allow students to learn by doing. Students serve as active constructors of knowledge by working collaboratively to solve problems and answer their own questions. Technology can enhance constructivist learning by providing interactive activities, but is not required as hands-on projects without technology also allow active learning.