Question

could someone tell me the two forms of information signals?

Answer 1

digital and analogue? or are you talking in more specific terms?

Answer 2

yes it is what I was looking for thanx, I just needed a second opinion to make sure, Could you explain modulation to me?

Answer 3

its when you take a signal that already transmits, like a standard sin wave and apply another signal some form of message or sound etc. to it. Modulate puts a signal into a transmission demodulation takes it out. Your modem (modulator + demod.) does both as an example.