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A JavaScript interpreter is built into your web browser (IE, Firefox, etc.). JavaScript is a language and all current web browsers include the ability to read and interpret JavaScript.
A JavaScript is a script someone writes for their website. You won't find it telling you something in the Windows Status bar — JavaScript works in the web browser.
Java, on the other hand, is a programming language from Sun Microsystems that is designed for use on multiple different operating systems. You have to download and install Java in order to run Java programs (get it at www.Java.com). For more discussion, see articles in Java, JavaScript, ActiveScript, VBScript and JScript for discussion). By the way, Java and JavaScript are not related.
Sun's Java installs an automatically-running program that checks for updates and tells you when updates are ready.
Should you update Java? Generally, yes. Just like web browsers, occasionally updates add functions — most of the time they fix bugs and security issues. By the way, the latest version of Java is 1.5.0.6.
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