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Audio: Travels through some kind of material (usually air). There is no air in space no one can hear you scream - this is because the sound has no air to travel through.
Radio: Radio is a form of electromagnetic (EM) radiation - (honestly that isn't as complicated as it sounds).
Light, heat, radio, UV, gamma, microwave and x-rays are all forms of EM radiation and therefore usually travel at the speed of light . EM radiation (such as radio) does not need a medium for it to travel. (You may sometimes hear EM radiation referred to as a particle called a photon, rather than a wave - this is just another model of how it works.)
Audio: Travels through some kind of material (usually air). There is no air in space no one can hear you scream - this is because the sound has no air to travel through.
Radio: Radio is a form of electromagnetic (EM) radiation - (honestly that isn't as complicated as it sounds).
Light, heat, radio, UV, gamma, microwave and x-rays are all forms of EM radiation and therefore usually travel at the speed of light . EM radiation (such as radio) does not need a medium for it to travel. (You may sometimes hear EM radiation referred to as a particle called a photon, rather than a wave - this is just another model of how it works.)
Re: What "carries" the audio/radio/ac,etc waves?
In a recent thread you asked if the oscillator transistor in a radio transmitter mechanically oscillates!
I answered that the transistor is in an oscillator circuit with no moving parts. I said the electrons go back and forth.
Now you are asking about how does a radio transmitter work, but it is obvious that you have not looked in books or in Google about it.
You built an FM transmitter so you should learn about what is FM, then learn some electronics so you can understand how an electronic oscillator works an how it can be modulated with audio.
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