Why Google Gives first Priority to Wikipedia?

[CarolineMurphy]

If we search anything, We get always "Wikipedia" on top.

My question is, Why Google Gives first Priority to Wikipedia?

[abhijepansd]

Wikipedia is good informational site. it provides good information about countries, places, cities popular people and great leaders.

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[dennis123]

Wikipedia sites Google page rank is 9 out of 10. That means it is one of the most huge and valuable web sites in the internet.(Google, yahoo, CNN,BBC are some websites that have page rank 9)
And it conatins about 70 different languages and over millions of pages that contain really valuable details. there is lots of details in Wikipedia. And also they are really unique. They don't copy paste from other sits, but other sits do that. That's why we can find lots of details in Wikipedia in lots of sites.That is the main points.
And it have almost every SEO tricks in a good number.