Answer:
A wave of sound!
Explanation:
sound waves are sound but sound comes in different wavelengths
The Function of a header is that it makes your TEXT LOOK BIGGER
the answer is virus scanner which is not hardware but software because if you didn't know hardware is stuff like a monitor a mouse a battery a case that's all stuff you can generally touch even the hardware inside the computer you can touch where as virus scanner you can not touch because its software again my point being its software NOT hardware
