What is constructivism and social constructivism

Social constructivism.
Social constructivism is a sociological theory of knowledge according to which human development is socially situated and knowledge is constructed through interaction with others.

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.

Social constructionism is the theory that people develop knowledge of the world in a social context, and that much of what we perceive as reality depends on shared assumptions.