What is Informal Education? On which website I can find articles on this topic?

Answer 1

" Free-choice learning (or informal education) [is] that learning which most typically occurs while people visit museums or other cultural institutions, watch television, read a newspaper, talk with friends, attend a play, or surf the Internet."

I found this website, but I don't know if this is helpful to you.
You can go to:
http://www.uoregon.edu/~otec/informal_education.htm

Hope this will help you.

Answer 2

This is a good site and should give you what you need.
http://www.infed.org/i-intro.htm