What is the difference between analog and digital communication?

Difference between Analog and Digital? Specifically component and HDMI?

• Ok so I understand the differences between analog and digital signals, like analog is a smooth flowing signal that represents the what ever is trying to be transmitted and digital is a binary signal to REPRESENT whatever is needed to be transmitted. I see how like a tape recording sound would be analog because it can have a continuously variable l level of magnetic variation but to me all cables seem like they would be digital. So basically what I asking is how to you send a analog signal through a cable, I thought all cables just sent electromagnetic pulses through a wire which would be like a yes or no value (digital). How would you get a smooth flowing signal? So a signal is transmitted through voltage in a wire, right? So is an analog signal like a continuously variable amount of voltage sent through a cable rather than a blips of higher or lower voltage?? I hope you understand what Im asking, I realize it must be confusing. :) Thanks Tom

• Answer:

  OK, I'll try, as u mentioned about tape recording as analog and put question it should be digital cuz the sound is transmitted through wire. i think every data transmitted through wire is not digital. the tape recorder reads the sound from silver brumide reel which is recorded in analog base. the wire used in read/write tape doesn't carry binary data it carries what it gets in reel. i don't know how it transfer but i know the wire doesn't carry data on 0 1 binary form. sorry i'm not good in eng.