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The Android SDK and Virtual Device Manager- It is used to create and manage Android Virtual Devices (AVD) and SDK packages. The AVD hosts an emulator running a particular build of Android, letting you specify the supported SDK version, screen resolution, amount of SD card storage available, and available hardware capabilities (such as touch screens and GPS). The Android Emulator- An implementation of the Android virtual machine designed to run within a virtual device on your development computer. Use the emulator to test and debug your Android applications. Dalvik Debug Monitoring Service (DDMS) - Use the DDMS perspective to monitor and control the Dalvik virtual machines on which you're debugging your applications. Android Asset Packaging Tool (AAPT) - Constructs the distributable Android package files (.apk). Android Debug Bridge,(adb) - Android Debug Bridge, is a command-line debugging application shipped with the SDK. It provides tools to browse the device, copy tools on the device, and forward ports for debugging.