jQuery is a JavaScript Library, which greatly simplifies JavaScript programming.
The purpose of jQuery is to make it much easier to use JavaScript on your website.
What Is jQuery?
jQuery is a lightweight, “write less, do more,” JavaScript library.
It takes many common tasks that require many lines of JavaScript code to accomplish, and wraps them into methods that you can call with a single line of code.
jQuery also simplifies many complicated things from JavaScript, like AJAX calls and DOM manipulation.
Its library contains the following functions:
HTML/DOM manipulation,
CSS manipulation,
HTML event methods,
Effects and animations,
AJAX, and
Utilities.
Will jQuery Work in all Browsers?
The jQuery team knows all about cross-browser issues, and they have written this knowledge into the jQuery library. jQuery will run exactly the same in all major browsers, including Internet Explorer 6!