Javascript is a Client-Side Web Language. This means that Javscript operates in the browser, after the page has been loaded, rather than being processed before the page loads.

Javascript reacts to things which the visitor does. Things such as enter text into text fields, select options from a drop down, Javascript can do a lot of things to help visually enhance your site, and make it more user-friendly.

I personally think that Javascript is great. It's easy to learn, and the amount of free scripts out there make it really easy to do whatever you wish with your web page.

Javascript and Java are two completely different computer languages. Javascript is a web language, while Java is a computing language.