Android is a mobile operating system initially developed by Android Inc., a firm purchased by Google in 2005.Android is based upon a modified version of the Linux kernel. It is a participant in the Open Handset Alliance(The Open Handset Alliance (OHA) is a business alliance of 78 firms for developing open standards for mobile devices).
Currently android technology is also used in Tablet PC’s.
The Android operating system software stack consists of Java applications running on a Java based object oriented application framework on top of Java core libraries running on a Dalvik virtual machine featuring JIT compilation. Libraries written in C include the surface manager, OpenCore media framework, SQLite relational database management system, OpenGL ES 2.0 3D graphics API, WebKit layout engine, SGL graphics engine, SSL, and Bionic libc. The Android operating system consists of 12 million lines of code including 3 million lines of XML, 2.8 million lines of C, 2.1 million lines of Java, and 1.75 million lines of C++.
Storage, Connectivity, Messaging , Web browser , Java support , Media support , Streaming media support , Additional hardware support , Development environment , Multi-touch , Bluetooth , Videocalling Multitasking , Voice based features and Tethering.
Android is open source and is replacing expensive technology in PC’s.As in
OLPC(One Laptop per Child) and the cheapest laptop from India(35$ laptop) is based on android technology.