The jQuery library is a single JavaScript file, containing all of its common DOM, event, effects, and Ajax functions. It can be included within a web page by linking to a local copy, or to one of the many copies available from public servers. jQuery has a CDN hosted by MaxCDN (moved from MediaTemple and, before that, Amazon). Google and Microsoft host it as well.
<script src="jquery.js"></script>
It is also possible to include jQuery directly from content delivery networks.
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
Features
Including the library
jQuery plug-ins
Browser support