A type that picks up vibration and the pickup is embedded under the bridge saddle most to a common Electric Acoustics.
It is necessary to drill the saddle which to pass the wiring through, and another hole for the end pin.
It has a distinctive sound.
A type that attaches to a sound hole and converts the magnetic force of a string into a signal and outputs it.
There are single coils and humbucking pickups as well as electric guitar pickups.
The output type requires the end pin to be drilled, but there is also a simple type that passes the cable directly out from the sound hole.
Note that due to the small size of the sound hole on some guitars, you may not be able to install a pickup.
It cannot be used for classical guitars with nylon strings.
Closer to the sound of an electric guitar, it has a softer tone than a piezo pickup.
It is a type that sticks to the body of the guitar and picks up the vibration of the top, and can be placed where your favorite tone can be found.
The output type requires the end pin to be drilled, but there is also a simple type that directly outputs the cable to the amplifier.
Other pickups
Condenser microphone
Dynamic microphone
Magnet & Condenser Microphone