Constructivism holds that learners build their own understanding and knowledge through experiences. Key theorists like Piaget, Vygotsky, and Montessori believed that learning is an active process where students use prior knowledge and social interactions to construct new understanding. The 5E model is used to support a constructivist environment through engaging students, allowing exploration, having students explain their understanding, elaborating on concepts, and ongoing evaluation of learning. Teachers provide tools and guidance for inquiry-based learning while students collaborate to build their own knowledge.