I can only see inline CSS and JS while viewing the source code of Google webpage. I don’t see any CSS file or JS file being included.
How do they include jquery, plugins etc? (or) Does Google use Jquery?
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Google uses Closure Compiler to compress its JavaScript.
No, Google certainly does not use jQuery—it is all vanilla JavaScript and (sometimes) Closure Library.
As for inlining, if JS/CSS is relatively small, it is faster to inline it to minimize the number of HTTP requests.
Google Page Speed Online can give you some tips on how to optimize your page.
mod_pagespeed for Apache can do many optimizations for you (including content inlining where appropriate).