J++

Microsoft's version of the popular Java language. (Suggested by: YTCC Guru)

Jaggies

The jagged edges that appear in graphics on diagonal or curved lines. The stair-step appearance is the result of trying to build a diagonal or curved line out of little squares. One solution is to create
the image in a large format and reduce it to the desired size

Java

Java is the next level in programming languages. It allows web site
developers to create interactive animations and programs for the
World Wide Web.

Java Applet

A small application written in Java  which can be embedded in an HTML document

JavaScript

A type of programming language developed by Netscape and 
based on Java (by Sun Microsystems). You use it add scrolling
text and other various features on webpages. 
Submitted By DukeNukemb

Jazz Drive

The Jaz Drive, made by Iomega, is a disk drive with disks that hold
1GB of information.

JoyStick

One of things that you plug in to the ADB port (mouse port) and 
you can play games like you are in a arcade.

JPEG

A new universal graphic standard designed to replace the old
GIF graphic standard. While GIF files can contain up to 256
colors, JPEG files (which stands for join photographic experts
group) can display up to to 16 million colors in a single graphic
image.

Jumper

A small, plastic, rectangular-shaped plug found on circuit boards. Usually, a two-or three prong pin sticks out of the circuit board, and the jumper slides over these pins.

Justification

Alignment of text on both left and right margins, except for last lines of paragraphs, which are flush left, and paragraph indents if used

Justify

To align text within the margins of a page, either left, right, center, or justified.