ADB (Android Debug Bridge) is a command-line tool used to communicate with an Android device or emulator instance. It allows developers to execute remote shell commands to control the device, copy files, install and uninstall apps, and more[1][2][4][5].
ADB consists of three components[2]:
Client - runs on the development machine and issues ADB commands
Server - runs as a background process on the development machine and manages communication between the client and daemon
Daemon - runs as a background process on each emulator or device instance
