Research on Learning in Formal and Informal Settings, National Science Foundation.

Informal education is a general term for education outside of a standard school setting. It can refer to various forms of alternative education, such as:

Formal vs. Informal Education, WGBH.

Informal Education, The National Academy of Sciences.

Autodidacticism (Self-teaching)

Unschooling or Homeschooling

The mass media and museums, libraries, zoos, and other community-based organizations and cultural institutions also offer forms of informal education.