MooTools is an open source, lightweight, modular object-oriented programming JavaScript Web application framework released under the MIT License. MooTools is a lightweight abstraction layer between the browser and the code you write .this is the definition of every is framework out there – Prototype, Dojo, jQuery, YUI, etc.

Mootools is a javascript library, like JQuery is … and it’s loaded by default with Joomla. It’s used for things like fancy fly in menus, picture affects, and more.

Mootools offers more functionality & richer tools for writing javascript, taking what has historicallyin the past been painful & filled with buggy environments & presenting you with a way more reliable surroundings.

MooTools also provides extensive DOM tools to let you pick elements from the document, generate new elements, and fine-tune them. There is also shortcut helper functions.

MooTools is free under the Open Source MIT license, which gives you the option to use it and modify it in every situation.

MooTools at its core re-creates pseudo-classical inheritance with Classes that allow for extensible and reusable behaviors.

It is provide its own set of classes to allow you to quickly and easily describe effects such as resizing, fading, moving, dragging, and more. The code to make something transition from one state to another is very succinct and MooTools does the rest.