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Search over 200 individual encyclopedias and reference books from the worlds most trusted publishers. Find facts, videos, and pictures on various topics, from history and science to culture and arts.
- Earth and Environment
Want to learn about earth and the environment? You’ll find...
- History Category
Few other categories or areas of study offer as rich or as...
- Places Category
Where in the world is this category? Everywhere. There are...
- Literature and The Arts
If people can create it, you’ll probably find it in this...
- People
The accomplishments of people are documented throughout this...
- Science and Technology
Science and technology is quite a broad category, and it...
- Sports and Everyday Life
This category covers the things that people do in their...
- Additional References
Encyclopedia.com – Online dictionary and encyclopedia with...
- Earth and Environment
Encyclopedia Britannica is a comprehensive and authoritative online reference source that covers a wide range of topics in history, science, arts, and culture. Explore articles, quizzes, videos, and more on Britannica's website.
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Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation. English 6,792,000+ articles Español 1.936.000+ artículos
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Wikipedia [note 3] is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the use of the wiki -based editing system MediaWiki. Wikipedia is the largest and most-read reference work in history.