I don't "get" CW.
I can't understand the chatter on an FM radio broadcast when my radio is set to AM. This makes sense, the signal is modulated using frequency modulation and I am trying to decode it with amplitude modulation so the result is scrambled nonsense.
Now, I often hear Morse code on the same channels and I can perfectly hear the dots and dashes when listening in FM mode. I guess the simple explanation is that the Morse code was FM modulated at the source, so there is no CW involved here, correct? Did I simply never listen to a CW modulated Morse broadcast?
The reason to use CW is the reduced bandwidth. Does this simply mean it's frequency modulated with a "smaller filter" or is CW really a different modulation type?
You can use AM or FM for voice, depending on the use case. Is this the same for Morse? You can use AM, FM or whatever mode to send Morse but CW is preferred since it's the most efficient mode? If so why do people use CW and Morse interchangeably? Are there any other reasons why you would use CW?