Android is a software platform and operating system for mobile devices based on the Linux operating system . It allows developers to write managed code in a Java-like language that utilizes Java libraries, but does not support programs developed in native code. The Android software stack, by comparison, could be installed on any number of handsets, with service from various mobile carriers around the world.

Android is getting popular day by day. Android is a platform for developing mobile applications easily and efficiently.

Android applications are to be written in Java Programming language. But these applications will not be run on traditional JVM. Rather android applications will be run on Dalvik. Dalvik is virtual machine highly optimized for mobile devices. The reason of using Dalvik is that application developed for mobile platform are supposed to be able to execute on minimum memory.