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What is the Android Emulator?

The Android Development Tools (ADT) include an emulator to run an Android system. The emulator
  behaves like a real Android device (in most cases) and allows you to test your application without
  having a real device.
  You can configure the version of the Android system you would like to run, the size of the SD card, the
  screen resolution and other relevant settings. You can define several of them with different
  configurations.
  These devices are called Android Virtual Device and you can start several in parallel.