Constructivism is a theory of learning that views knowledge as constructed by learners based on their experiences and prior knowledge. Central ideas include that learning is an active process where learners select information, form hypotheses, and rely on cognitive structures. Influential proponents include Piaget, Vygotsky, Dewey, and Bandura. Constructivist teachers create a creative learning environment that allows open interpretation and adapts to student needs, while students engage in exploratory learning based on their interests and take ownership of their individualized learning.