The electric guitar and the acoustic guitar are two instruments, right? Why do some people say they are the same and others say they are two?

Um, this is of course two instruments. Say is a kind of, that is because the electric guitar is the evolution of the guitar, the guitar is also divided into many kinds of, only the electric guitar is the last update. The first thing you need to know is that the electric guitar, the electric guitar, has to be electrified and connected to an amp in order to make sound, whereas the acoustic guitar relies on the vibration of its own case and strings to make sound.

Get it?