What is Android Debug Bridge (ADB)? The internal structure of the Android Debug Bridge (ADB) is based on the classic client-server architecture. There are three components that make up the whole process. A client, that is, a PC or Mac that you have connected to an Android device. We send commands from this computer to our device using a USB cable (and in some cases wirelessly). A daemon (adbd) that executes commands on a device. The daemon runs as a background process on any device. A server that manages communication between a client and a daemon. The server runs as a background process on a PC / Mac. How does ADB work? Since the ADB consists of three parts (client, daemon, and server), certain parts must come first. So, if you've restarted your computer (and haven't set it up to start the daemon on startup), you'll need to start it before you can send traffic to the target Android device. The following message is displayed on the command line or in Terminal wh...