Is it like blackberry application which u download from the internet same like u have to download application from the internet
Android is an operating system for mobile devices such as smartphones and tablet computers. Android consists of a kernel based on the Linux kernel, with middleware, libraries and APIs written in C and application software running on an application framework which includes Java-compatible libraries based on Apache Harmony. Android uses the Dalvik virtual machine with just-in-time compilation to run Dalvik dex-code (Dalvik Executable), which is usually translated from Java bytecode.