While it might be tempting to provide your own copy of jQuery as part of a new plugin that uses the popular JavaScript library or to access a copy from the Google API website, WordPress actually provides a copy of jQuery in its installation and makes it very easy to load it.
By using the appropriate utility function to load jQuery, developers make a request to WordPress to load this library instead of doing it themselves. Once all the requests have been received, they are analyzed for duplicates and a single instance of each script is loaded to reduce the chance of conflicts between multiple copies of the same library.
This recipe shows how to load the jQuery script for use on front-facing website pages.
