Java
Java is a programming language invented by Sun Microsystems.
Java programs (or "applets") can be downloaded from the Internet to
your computer. They are often used to enhance Web pages. Common Java
applets used on Web pages include animation, calculators, and
counters.
JavaScript
A
scripting language that interacts with HTML source code, allowing
for interactive Web sites. JavaScript is used for things such as
"rollover buttons" (graphics that change color when you run your
mouse over them), rotating banners, MIDI jukeboxes, pop-up windows,
etc.
JPEG (or
JPG)
Joint Photographic Experts Group: a type of image file,
similar to GIF. Whereas the GIF file format is limited to 256
colors or less, JPEG files use millions of colors and can often be
compressed to a smaller kilobyte size, making Web pages load faster.