By default jQuery is loaded internally, but you can also load it from a CDN.
Add the following lines to the functions.php:
// Making jQuery to load from Google Library
function replace_jquery()
{
if (!is_admin()) {
// comment out the next two lines to load the local copy of jQuery
wp_deregister_script('jquery');
wp_register_script('jquery', 'https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js', false, '1.11.3');
wp_enqueue_script('jquery');
}
}