jQuery 1 - Introduction to jQuery - Features of jQuery - What is jQuery

Introduction to jQuery
Features of jQuery
What is jQuery?
Why should we use jQuery?

What is jQuery?

jQuery is a fast, small and feature-rich JavaScript library included in a single .js file.
jQuery makes a web developer's life easy.
It provides many built-in functions using which we can accomplish various tasks easily and quickly.
According to the definition of jQuery.com :
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.

Why should we use jQuery ?
jQuery provides following important features:
DOM selection.
DOM manipulation.
Special effects.
Events.
Ajax.
Cross-browser support.

DOM selection :
jQuery provides Selectors to retrieve DOM element based on different criteria like tag name, id, css class name, attribute name, value, nth child in hierarchy etc.

DOM manipulation :
You can manipulate DOM elements using various built-in jQuery functions.
For example, adding or removing elements, modifying html content, css class etc.

Special Effects :
You can apply special effects to DOM elements like show or hide elements, fade-in or fade-out of visibility, sliding effect, animation.

Events :
jQuery library includes functions which are equivalent to DOM events like click, dblclick, mouseenter, mouseleave, blur, keyup, keydown etc. These functions automatically handle cross-browser issues.

Ajax :
jQuery also includes easy to use AJAX functions to load data from servers without reloading whole page.

Cross-browser support:
jQuery library automatically handles cross-browser issues, so the user does not have to worry about it.
jQuery supports IE 6.0+, FF 2.0+, Safari 3.0+, Chrome and Opera 9.0+.
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