7.1 An Overview of the Android Debug Bridge (ADB)
The primary purpose of the ADB is to facilitate interaction between a development system, in this case Android Studio, and both AVD emulators and physical Android devices for the purposes of running and debugging applications.
The ADB consists of a client, a server process running in the background on the development system and a daemon background process running in either AVDs or real Android devices such as phones and tablets.
The ADB client can take a variety of forms. For example, a client is provided in the form of a command-line tool named adb located in the Android SDK platform-tools sub-directory. Similarly, Android Studio also has a built-in client.
A variety of tasks may be performed using the adb command-line tool. For example, a listing of currently active virtual or physical devices may be obtained using the devices command-line argument. The following command output indicates the presence of an AVD on the system...
