2 pages long definition paper in the major of Electronics

That is what my homework is actually:

A 1-2 page paper defining and explaining a technical mechanism, procedure, device, or concept, or a scientific

problem and its significance intended for a non-technical, non-expert audience. For example, you might define 

a Java applet, a haptic interface, the mechanisms of Alzheimer’s disease, or an electron microscope. Topics 

must be related to your major or general focus. For example, mathematics or engineering students may not 

choose a medical topic, or vice versa.

It should be 2 pages with double spaced. You can choose any topic about electronic major