In reply to alex.

@alex - JavaScript is not Java - they are two completely different programming languages.

JavaScript is the stuff browsers use to make things hide and show on screen, it typically powers the majority of all online slideshows, and JavaScript allows WordPress to do the nifty drag and drop functionality with media uploads among other useful user experience enhancements. In other words, its a fast scripting language for browsers to use to provide interactivity.

Java is a completely different beast and is used primarily for enterprise development when you need an application to work with many different enterprise systems and work across a wide variety of operating systems. It's not really web/browser focused per se.