The Android Debug Bridge (ADB) is a client-server tool used to enable developers to debug Android code on the emulator and the device using a standard Java IDE such as Eclipse.The DDMS and the Android Development Plug-In for Eclipse both use the ADB to facilitate interaction between the development environment and the device (or emulator).
Developers can also use ADB to interact with the device file system, install Android applications manually, and issue shell commands. For example, the sqlite3 shell commands enable you to access device database.The Application Exerciser Monkey commands generate random input and system events to stress test your application. One of the most important aspects of the ADB for the developer is its logging system (Logcat). For an exhaustive reference, see the Android SDK Documentation at
http://developer.android.com/guide/developing/tools/adb.html
