Little bit about jQuery

jQuery is a cross-platform JavaScript library designed to simplify the client-side scripting of HTML. Used by over 60% of the 10,000 most visited websites, jQuery is the most popular JavaScript library in use today. JQuery is free, open-source software licensed under the MIT License.
jQuery's syntax is designed to make it easier to navigate a document, select DOM(Document Object Model) elements, create animations, handle events, and develop Ajax applications. jQuery also provides capabilities for developers to create plug-ins on top of the JavaScript library. This enables developers to create abstractions for low-level interaction and animation, advanced effects and high-level, theme-able widgets. The modular approach to the jQuery library allows the creation of powerful dynamic web pages and web applications.

Here is a little example how simple and short jQuery is comparing it to JavaScript Code.

jQuery

$ (‘body’) .css (‘background’, ‘#ccc’);

JavaScript

Function changeBachground(color) {

        Document.body.style.background = color;

}

Onload=”changeBackground (‘red’);”