What language is used to program Google and Gmail [closed]

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I want to know what language is used to program Google and Gmail is it python or Java or what exactly is running at their core from programming languages part?开发者_StackOverflow

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Google's official languages are Java, Python, C++ and JavaScript I believe.

I would be amazed if they are using .NET in any serious capacity.

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.NET, C++, and java

Source: http://mirnazim.wordpress.com/2006/06/16/what-language-is-google-written/