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J

Java
A general-purpose programming language developed by Sun Microsystems that can be used on computers using any kind of operating system. Java is used to develop small applications for Web pages called applets. Java applets are sent over the Internet and run on your computer immediately, and are often used to create dynamic Web page features like stock tickers, animations, and calculators.

Java Script
JavaScript was developed by Netscape and is NOT technically Java. Rather, it is a "scripting" language which, like Java, is used to create dynamic content on Web pages. JavaScript is often used to create "rollover" effects which change page content when the mouse cursor runs over a specified image or link. A good, general JavaScript reference is found on the Netscape site. Webreference.com has a great collection of JavaScript tips.

JPEG
Joint Photographic Experts Group. JPEG is a graphics file type, like a GIF, often used on the Web. JPEG images are used primarily for high-quality photographs and are commonly of larger file sizes than GIFs.