Android runtime
Android includes a set of core libraries that provides most of the functionality available in the core libraries of the Java programming language. Every Android application runs in its own process, with its own instance of the Dalvik virtual machine. Dalvik has been written so that a device can run multiple VMs efficiently. The Dalvik VM executes files in the Dalvik Executable (.dex) format, which is optimised for minimal memory footprint. The VM is register-based, and runs classes compiled by a Java language compiler that has been transformed into the .dex format by the included dx tool. Interested in knowing more about the .dex file format? Please refer to http://retrodev.com/android/ dexformat.html The Dalvik VM relies on the Linux kernel for underlying functionality such as threading and low-level