What is the concept of constructivism

constructivist teaching approaches, learners freely voice their own thoughts and share their opinions.
Lately, studies have focused on the affective domain of learning such as:

constructivism:

constructivism (noun) A theory of learning based on the idea that humans construct their own knowledge through direct experience , as opposed to being taught concepts in the abstract.
A constructivist teacher believes that in order to learn, students need as many hands-on experiences with objects, skills, and people as possible.

The constructivist theory of learning, whose philosophical origins are frequently ascribed to Kant and whose educational origins to Piaget, is based on the premise that the act of learning is based on a process which connects new knowledge to pre-existing knowledge.