Our jQuery free tutorial will help you to learn jQuery fundamentals, jQuery examples, jQuery selectors, jQuery events, jQuery effects, jQuery traversing, CSS, and jQuery attributes. Learn jQuery step by step from basics to advanced level. These jQuery tutorials start from setting up environment, basic syntax, selectors, jQuery methods.
jQuery
jQuery is a fast, small, cross-platform and feature-rich JavaScript library. It is designed to simplify the client-side scripting of HTML. It makes things like HTML document traversal and manipulation, animation, event handling, and AJAX very simple with an easy-to-use API that works on a lot of different type of browsers.

The main purpose of jQuery is to provide an easy way to use JavaScript on your website to make it more interactive and attractive. It is also used to add animation.

What is jQuery
jQuery is a small, light-weight and fast JavaScript library. It is cross-platform and supports different types of browsers. It is also referred as ?write less do more? because it takes a lot of common tasks that requires many lines of JavaScript code to accomplish, and binds them into methods that can be called with a single line of code whenever needed. It is also very useful to simplify a lot of the complicated things from JavaScript, like AJAX calls and DOM manipulation.

jQuery is a small, fast and lightweight JavaScript library.
jQuery is platform-independent.
jQuery means "write less do more".
jQuery simplifies AJAX call and DOM manipulation.
jQuery Features
Following are the important features of jQuery.

HTML manipulation
DOM manipulation
DOM element selection
CSS manipulation
Effects and Animations
Utilities
AJAX
HTML event methods
JSON Parsing
Extensibility through plug-ins
Why jQuery is required
Sometimes, a question can arise that what is the need of jQuery or what difference it makes on bringing jQuery instead of AJAX/ JavaScript? If jQuery is the replacement of AJAX and JavaScript? For all these questions, you can state the following answers.

It is very fast and extensible.
It facilitates the users to write UI related function codes in minimum possible lines.
It improves the performance of an application.
Browser's compatible web applications can be developed.
It uses mostly new features of new browsers.