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Search over 200 encyclopedias and reference books from trusted publishers. Find facts, definitions, and examples for your homework, research, or curiosity.
- Earth and Environment
Want to learn about earth and the environment? You’ll find...
- History
Few other categories or areas of study offer as rich or as...
- Literature and the Arts
If people can create it, you’ll probably find it in this...
- Medicine
The history of medicine can be traced back as far as...
- People
The accomplishments of people are documented throughout this...
- Philosophy and Religion
Throughout history, philosophy and religion have played a...
- Places
Where in the world is this category? Everywhere. There are...
- Plants and Animals
The surface of the earth is covered with plants and animals,...
- Earth and Environment
Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Explore the fact-checked online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of objective articles, biographies, videos, and images from experts.
The free online history encyclopedia with fact-checked articles, images, videos, maps, timelines and more; operated as a non-profit organization.
Internetowa encyklopedia PWN - zawierająca ok. 200 tysięcy artykułów, haseł, ilustracji, kalendariów, tabel ze stale aktualizowanej bazy encyklopedycznej Wydawnictwa Naukowego PWN - to najlepsze źródło rzetelnej i wiarygodnej wiedzy.
The largest online encyclopedias are general reference works, though there are also many specialized ones. Some online encyclopedias are editions of a print encyclopedia, such as Encyclopædia Britannica, whereas others have always existed online, such as Wikipedia.
Wikipedia, the free encyclopedia. Welcome to Wikipedia. , the free encyclopedia that anyone can edit. 6,897,848 articles in English. From today's featured article. Gaga performing "Bad Romance" "Bad Romance" is a song by American singer Lady Gaga (pictured) from her third extended play, The Fame Monster (2009).
