• Official document is at adb

• ADB (Android Debug Bridge):How it works? by Tetsuyuki Kobayashi

Components

• server (pc)

• client (pc)

• daemon (Android devices or emulators)

serial number

The output for each instance is formatted like this

serialNumber state

Here is an example showing the devices command and its output:

$ adb devices
List of devices attached
emulator-5554  device
emulator-5556  device
emulator-5558  device