Android Virtual Devices
An AVD represents a device configuration. For example, you could have an AVD representing a really old Android device running version 1.5 of the SDK with a 32MB SD card. The idea is that you create AVDs you are going to support and then point the emulator to one of those AVDs when developing and testing your application. Specifying (and changing) which AVD to use is very easy and makes testing with various configurations a snap. Earlier, you saw how to create an AVD using Eclipse. You can make more AVDs in Eclipse by choosing Window 
AVD Manager. You can also create AVDs using the command line. Here's how.
To create an AVD, ...
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