jQuery is a lightweight JavaScript library that emphasizes interaction between JavaScript and HTML.
MIT License and the GNU General Public License
Developers: You can download a copy at jQuery.org and read nice tutorial
jQuery allows easy dynamic html management and ajax calls. For example, if you want to change ad text on page every minute withou reload, code is trivial:
function updateAd() {
jQuery.get('time.php', function(adText, textStatus) {
jQuery("#ad").text(adText);
setTimeout('updateAd();', 60000);
});
}
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Also this library can help with interactive applications like chats, messengers and so on