Wikipedia
Wikipedia ( or ) is a free, multilingual online encyclopedia written and maintained by a community of volunteer contributors through a model of open collaboration, using a wiki-based editing system. Wikipedia is the largest and most-read reference work in history, and is consistently one of the 15 most popular websites as ranked by Alexa; as of 2021, it was ranked as the 13th most popular site. The project carries no advertisements and is hosted by the Wikimedia Foundation, an American non-profit organization funded mainly through user donations.

Wikipedia was launched on January 15, 2001, by Jimmy Wales and Larry Sanger; Sanger coined its name as a blending of "wiki" and "encyclopedia". Initially available only in English, versions in other languages were quickly developed. The English Wikipedia, with articles as of , is the largest of the language editions and nearly 600 new articles are added each day. Combined, Wikipedia's editions comprise more than articles, that attract more than 1.7billion unique device visits and receive more than 17 million edits per month, or develop at a rate of 1.9 edits per second.

Wikipedia has received praise for its enablement of the democratization of knowledge, extent of coverage, unique structure, culture, and reduced amount of commercial bias, but criticism for exhibiting systemic bias, particularly gender bias against women. Its reliability was frequently criticized in the 2000s, but has improved over time and has been generally praised in the late 2010s and 2020s. Its coverage of controversial topics such as American politics and major events such as the COVID-19 pandemic has received substantial media attention. At various points, Wikipedia has been censored by world governments, ranging from the blocking of specific pages to bans on the entire site. Wikipedia has become an element of popular culture, with references in books, films and academic studies. In 2018, Facebook and YouTube announced that they would help users detect fake news by suggesting fact-checking links to related Wikipedia articles.
Q14075
free
Concept
Q615699
online encyclopedia
Concept
Q876040
a community of volunteer contributors
Concept
Q15930270
open collaboration
Concept
Q171
wiki
Concept
Q13136
reference work
Concept
Q230051
Alexa
ORG
Q624902
advertisement
Concept
Q180
Wikimedia Foundation
ORG
Q18325436
American non-profit organization
Concept
Q181
Jimmy Wales
PER
Q185
Larry Sanger
PER
Q208674
blending
Concept
Q1860
English
Concept
Q328
English Wikipedia
ORG
Q21010653
language editions
UNK
Q1972558
democratization of knowledge
Concept
Q1002238
criticism
ORG
None
systemic bias
UNK
Q17002416
gender bias
Concept
Q195951
Its reliability
MEDIA
Q104877149
such as American politics
UNK
Q91493633
such as the COVID-19 pandemic
UNK
Q2494151
Wikipedia has been censored
MEDIA
Q2917261
Wikipedia has become an element of popular culture
UNK
Q2798582
books
MEDIA
Q6619917
films
UNK
Q870337
academic studies
UNK
Q355
Facebook
MEDIA
Q866
YouTube
MISC
Q28549308
fake news
Concept
Q105032316
fact-checking links to related Wikipedia articles
UNK
Q52
Wikipedia
MEDIA
Q52
Wikipedia
MEDIA
Q52
Wikipedia
MEDIA
Q52
Wikipedia
MEDIA
Q52
Wikipedia
MEDIA
Q52
Wikipedia
MEDIA
Q52
Wikipedia
MEDIA
2021-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2021
DATE
2001-01-15T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
January 15, 2001
DATE
2000-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2000
DATE
2010-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2010
DATE
2020-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2020
DATE
2018-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2018
DATE
+15^^http://www.w3.org/2001/XMLSchema#decimal
15
NUMBER
+13^^http://www.w3.org/2001/XMLSchema#decimal
13
NUMBER
+1.7^^http://www.w3.org/2001/XMLSchema#decimal
1.7
NUMBER
+17^^http://www.w3.org/2001/XMLSchema#decimal
17
NUMBER
+1.9^^http://www.w3.org/2001/XMLSchema#decimal
1.9
NUMBER
-19^^http://www.w3.org/2001/XMLSchema#decimal
-19
NUMBER
instance of
item operated
owned by
founded by
founded by
inception
is a list of
legal form
facet of
facet of