Computer Concepts With SD

VIRUS   Stands for  Vital Information Resource Under Seize . What is Virus? A computer virus is a program or piece of   code   that is loaded onto your computer without your knowledge and runs against your wishes. Viruses can also replicate themselves. All   computer  viruses are man-made. A simple virus that can make a   copy   of itself over and over again is relatively easy to produce. Even such a simple virus is dangerous because it will quickly use all available memory   and bring the   system   to a halt. An even more dangerous type of virus is one capable of transmitting itself across   networks and bypassing   security   systems. In other words Computer viruses are small software programs that are designed to spread from one computer to another and to interfere with computer operation. A virus might corrupt or delete data on your computer, use your e-mail program to spread itself to other computers, or even erase everything on your hard disk. Computer v

Inventions and Inventors/Founders COMPUTER - Charles Babbage MOUSE - Doug Engelhard Computer Keyboard - Christopher Latham Sholes RAM - Robert Dennard PRINTER - Chester Carlson LINUX - Linus Torvalds UNIX - Dennis Ritchie MICROSOFT WINDOWS - Bill Gates and Paul Allen GOOGLE - Larry Page ,  Sergey Brin YAHOO - Jerry Yang and David Filo REDIFF - Ajit Balakrishnan MOZILLA FIREFOX - Dave Hyatt  and  Blake Ross EMAIL – It’s a Confusion between Shiva Ayyadurai & Ray Tomlinson.  WWW (World Wide Web) - Tim Berners-Lee APPLE iPhone – Steve Jobs AMAZON - Jeff Bezos FLIPKART - Binny Bansal ,  Sachin Bansal Ebay - Pierre Omidyar ALIBABA.COM - Jack Ma ,  Peng Lei SNAPDEAL - Kunal Bahl & Rohit Bansal HCL (Hindustan Computers Limited) -  Shiv Nadar &  Arjun Malhotra Smartphone – IBM (Smartphone named as SIMON) Headphones - Nathaniel Baldwin ATM machine - John Adrian Shepherd-Barron & Donald Wetzel

OPERATING SYSTEM An Operating system is a program that acts as an interface between the user of a computer and computer hardware. The purpose of an operating system is to provide an environment in which user can execute programs in a convenient and efficient manner. It is the first program loaded into the computer's memory after the computer is switched on. Popular operating systems include MS-DOS, OS/2. Windows and UNIX. The operating system is an important component of the computer system, because it sets the standards for the application programs that run on it. All programs must be written in a manner, which is recognized by the operating system. An Operating System is like a soul of a computer, Without an Operating System  a computer considered as dead, It has no use. Functions of Operating System 1. Memory Management Function An Operating System manages the primary memory of the system. It allocates the memory, on the request of a process, which is being run at

Computer Keyboard                          Computer Keyboard is an electro-mechanical  component. It creates special standardized electronic codes when a key is pressed. The codes are transmitted along the cable that connects the keyboard to the computer system unit or terminal, where the incoming code is analyzed and converted into appropriate computer usable code. Keyboards comes in a variety of sizes and shapes having a number of features in common. A Computer Keyboard is a primary input device which is used in computers to input data. The computer keyboard has a keys like a typewriter it look likes typewriter. These keys are called QWERTY keys. These keys are 0-9 and character keys like A-Z and special symbols like ~!@#$%^& etc. The Keys on the top of the Keyboard are called Function Keys . It starts from F1 to F12 , these are programmable keys. Special Purpose Keys Backspace Key       Backspace key erases one character to the left of the cursor. Enter Key

Android Versions Did you noticed that the android versions are started alphabetically from A to Z, and now it’s on N. The development of android started in 2003 by Android Inc. Which was purchased by google in 2005. The two internal releases was Alpha and Beta and later the series continued from initial letter C. The Names of android versions are set on the Sweets. Let’s see the Versions of Android.                                                              Android 1.0           Released on September 23, 2008 Android 1.1 ( Internally Knows as “Petit Four”)            Released on February 9, 2009 Cupcake (Android 1.5)               Released on April 30, 2009 Donut     (Android 1.6)                   Released on September 15, 2009 Éclair  (Android 2.0, Android 2.1)                       Released on October 26, 2009 Froyo