J

Java
a newly popular language which is used to write both full computer applications and small applets for web pages. Its goal is to create applications that will run on any computer, unlike other languages which are not cross-platform
JavaScript
a scripting language used mostly on web pages. Not related to Java.
joystick
a device which controls cursor motion with a vertical stick. Usually has more buttons than a mouse. Used in flying games especially.
jumper
a small piece that slides over two pins at the same time. Jumpers are used on the motherboard, hard drives, and some peripheral cards.
justification
alignment of text: left, center, right, full