Constructivism is a teaching theory where students actively construct their own understanding and knowledge through experiences and reflecting on those experiences. Under this theory, students learn best when they engage with lessons by completing interactive activities and projects rather than passive lecturing. Key theorists who developed constructivism believed learning is built on prior knowledge and occurs through social and cultural experiences. In a constructivist classroom, the teacher creates interactive lessons that allow students to solve real-world problems in order to fully understand course content.