Android is an operating system for mobile devices such as smartphones and tablet computers. It is developed by the Open Handset Alliance led by Google.

Google purchased the initial developer of the software, Android Inc., on August 17, 2005. The unveiling of the Android distribution on November 5, 2007 was announced with the founding of the Open Handset Alliance, a consortium of 84 hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices. Google released most of the Android code under the Apache License, a free software license.The Android Open Source Project (AOSP) is tasked with the maintenance and further development of Android.

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.

Android has a large community of developers writing applications (“apps”) that extend the functionality of the devices. Developers write primarily in a customized version of Java. As of October 2011 there were more than 300,000 apps available for Android, and the estimated number of applications downloaded from the Android Market as of December 2011 exceeded 10 billion.Apps can be downloaded from third-party sites or through online stores such as Android Market, the app store run by Google.

Android was listed as the best-selling smartphone platform worldwide in Q4 2010 by Canalys with over 200 million Android devices in use by November 2011,across the several versions of the operating system. As of December 2011 there are over 700,000 Android devices activated every day.

Android 4.0 (Ice Cream Sandwich) is the latest version of the 2011 Android platform for  phones, tablets, and more. It builds on the things people love most about Android — easy   multitasking, rich notifications, customizable home screens, resizable widgets, and deep   interactivity — and adds powerful new ways of communicating and sharing.

Input and Output devices

In Computers, input/output, or I/O, refers to the communication between an information processing system (such as a computer), and the outside world, possibly a human, or another information processing system. Inputs are the signals or data received by the system, and outputs are the signals or data sent from it. The term can also be used as part of an action; to “perform I/O” is to perform an input or output operation. I/O devices are used by a person (or other system) to communicate with a computer. For instance, a keyboard or a mouse may be an input device for a computer, while monitors and printers are considered output devices for a computer. Devices for communication between computers, such as modems and network cards, typically serve for both input and output.

Note that the designation of a device as either input or output depends on the perspective. Mouse and keyboards take as input physical movement that the human user outputs and convert it into signals that a computer can understand. The output from these devices is input for the computer. Similarly, printers and monitors take as input signals that a computer outputs. They then convert these signals into representations that human users can see or read. For a human user the process of reading or seeing these representations is receiving input. These interactions between computers and humans is called human–computer interaction.

In computer architecture, the combination of the CPU and main memory (i.e. memory that the CPU can read and write to directly, with individual instructions) is considered the brain of a computer, and from that point of view any transfer of information from or to that combination, for example to or from a disk drive, is considered I/O. The CPU and its supporting circuitry provide memory-mapped I/O that is used in low-level computer programming in the implementation of device drivers. An I/O algorithm is one designed to exploit locality and perform efficiently when data reside on secondary storage, such as a disk drive.

Steve Jobs

Steven Paul “Steve” Jobs (February 24, 1955 – October 5, 2011) was an American inventor and entrepreneur. He was co-founder, chairman, and chief executive officer of Apple Inc. Jobs was co-founder and previously served as chief executive of Pixar Animation Studios; he became a member of the board of directors of the Walt Disney Company in 2006, following the acquisition of Pixar by Disney.

In the late 1970s, Jobs — along with Apple co-founder Steve Wozniak, Mike Markkula and others — designed, developed, and marketed one of the first commercially successful lines of personal computers, the Apple II series. In the early 1980s, Jobs was among the first to see the commercial potential of Xerox PARC’s mouse-driven graphical user interface, which led to the creation of the Apple Lisa and, one year later, the Macintosh. After losing a power struggle with the board of directors in 1985, Jobs left Apple and founded NeXT, a computer platform development company specializing in the higher-education and business markets.

In 1986, he acquired the computer graphics division of Lucasfilm Ltd, which was spun off as Pixar Animation Studios. He was credited in Toy Story (1995) as an executive producer. He remained CEO and majority shareholder at 50.1 percent until its acquisition by The Walt Disney Company in 2006,making Jobs Disney’s largest individual shareholder at seven percent and a member of Disney’s Board of Directors. Apple’s 1996 buyout of NeXT brought Jobs back to the company he co-founded, and he served as its interim CEO from 1997, then becoming permanent CEO from 2000 onwards, spearheading the advent of the iPod, iPhone and iPad. From 2004, he fought a long battle with cancer,  eventually leading to his resignation as CEO in August 2011, during his third medical leave. After his resignation, Jobs was elected chairman of Apple’s board of directors.

On October 5, 2011, around 3:00 pm, Jobs died at his home in Palo Alto, California, aged 56, six weeks after resigning as CEO of Apple. A copy of his death certificate, which was made public on October 10, indicated respiratory arrest as the immediate cause of death, with “metastatic pancreas neuroendocrine tumor” as the underlying cause. His occupation was listed as “entrepreneur” in the “high tech” business. He was widely described as a visionary, pioneer and genius. According to a research, Steve Jobs did more than 70% of his innovative work in the last 7-8 years of his life i.e. after mid 2004.