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Introduction to JQuery

jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers. With a combination of versatility and extensibility, jQuery has changed the way that millions of people write JavaScript.


jQuery's syntax is designed to make it easier to navigate a document, select DOM 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, themeable widgets. The modular approach to the jQuery library allows the creation of powerful dynamic web pages and Web applications.

jQuery Features
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

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.

There are lots of other JavaScript libraries out there, but jQuery is probably the most popular, and also the most extendable.