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The World’s #1 Online Encyclopedia. Search over 200 individual encyclopedias and reference books from the worlds most trusted publishers. Read more about our content and why so many people love it.
- 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...
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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...
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Encyclopedia.com – Online dictionary and encyclopedia with...
- Earth and Environment
Wikipedia is a free content, multilingual online encyclopedia written and maintained by a community of volunteer contributors, known as Wikipedians, through a model of open collaboration. It is the largest and most-read reference work in history. Wikipedia originally developed from another encyclopedia project called Nupedia. See also
An online encyclopedia, also called an Internet encyclopedia, is a digital encyclopedia accessible through the Internet. Examples include Encarta from 2000 to 2009, Wikipedia since 2001, the Encyclopædia Britannica since 2016, and Encyclopedia.com since 1998.
Wikipedia 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.
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Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.
Encyclopaedia Britannica is the oldest English-language general encyclopedia. The Encyclopaedia Britannica was first published in 1768, when it began to appear in Edinburgh, and its first digital version debuted in 1981. In 1994 Britannica released the first Internet-based encyclopedia, and Britannica.com was launched in 1999.
10,000+ articles. 1,000+ articles. 100+ articles. Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
