Basics of Information Technology

Operating system                               Operating system is a computer program that prepares the computer to be used by human user. It managed the computer hardware, central processing unit, memory, drivers, printers, etc. it also runs application software.             Operating system programs reside in the main memory of the computer and control all operations of the computer. Commonly used operating systems are Unix, Mac OS, MS-DOS, OS/2 and Windows.             A set of program running in the background on a computer system and providing an environment in which other program can be executed and the computer system can be used efficiently. It manages the software and resources of the system. These resources may include the process, m4emory, storage devices, in...

Software its types and Programing Languages SOFTWARE             Software is a program to issue some instructions to the computer hardware to get the desired results. Computer Hardware only understands binary language i.e. 0 and 1.   Digital signals are used to make communication possible and to accomplish some tasks from the computer hardware. Software tells the program what to do. The hardware operates under the control of given set of instructions.   Software is developed in computer programming language.             Software is a program, set of functions, functions are set of instructions, and we write some instructions with the help of programming languages. i.e. C, C++, Java, Visual Basic 6.0, Visual Basic Dot Net, Visual C++. 1.       Logical part of the computer is called software. 2.       Intangible part of the computer ...

               We use a term GIGO for computer, Garbage In Garbage Out. It means that the output of the computer depends upon the input. Out put of the computer depends upon the input data and instructions given to it.                  We categorize hardware into to categories input devices and output devices.   INPUT             We use computer simply for some kind of calculations. For calculations we require some instructions given to the computer hardware to execute the desired task. The instructions given to the computer hardware are considered as input.   INPUT DEVICES             The devices that are used to enter data and instruction into the computer are called input devices. The input device is a hardware component. It takes input (data or instruction) from user...