Original source

The philosophical position known as constructivism views knowledge as a human construction. The various perspectives within constructivism are based on the premise that knowledge is not part of an objective, external reality that is separate from the individual. Instead, human knowledge, whether the bodies of content in public disciplines (such as mathematics or sociology) or knowledge of the individual learner;
is a human construction.
References:
Gredler, M. E. (2001). Learning and instruction: Theory into practice (4th
Ed.). Upper Saddle, NJ: Prentice-Hall.

Student version

Constructivist philosophers assert that knowledge is made by humans themselves. Knowledge is not "out there" in some external reality separate from Us. It is we humans who create the content in disciplines such as math and biology. That knowledge would not exist without people making it.
References:
Gredler, M. E. (2001). Learning and instruction: Theory into practice (4th
Ed.). Upper Saddle, NJ: Prentice-Hall.

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