COMPUTER SYSTEM

• a computer system is defined as combination of components designed to process data and store files.
• a computer system consists of four major hardware components, input devices, output devices , processor and storage devices.

input devices

• when data is entered into the computer system, it is called an input. 
• input comes in various forms ; texts, graphics, audio and video. input devices are needed to input data into the computer system.
• exp: keyboard, mouse, scanner, barcode reader and digital camera.

output devices

• output is the result of raw input data that has been processed by the central processing unit into meaningful information.
• in a form of texts, number, graphics, sounds, animations and videos.
• exp; monitor, speaker, and printer.

storage devices

• secondary storage
• consists:- hard disk. Floppy Disk, diskette, CD ROM & DVD ROM

processor

• has the same important as the brain to human being
• exp:- CPU/ SISTEM UNIT (SU)

APPLICATION SOFTWARE

Application software is all the computer software that causes a computer to perform useful tasks beyond the running of the computer itself. A specific instance of such software is called a software application, application or app.

he term is used to contrast such software with system software, which manages and integrates a computer's capabilities but does not directly perform tasks that benefit the user. The system software serves the application, which in turn serves the user.

Examples include enterprise software, accounting software, office suites, graphics software and media players. Many application programs deal principally with documents. Applications may be bundled with the computer and its system software or published separately, and can be coded as university projects

Application software applies the power of a particular computing platform or system software to a particular purpose.

Some applications are available in versions for several different platforms; others have narrower requirements and are thus called, for example, a Geography application for Windows or an Android application for education or Linux gaming. Sometimes a new and popular application arises which only runs on one platform, increasing the desirability of that platform. This is called a killer application.

SYSTEM SOFTWARE

System software (or systems software) is computer software or an operating system designed to operate and control the computer hardware and to provide a platform for running application software.

Device drivers such as computer BIOS and device firmware provide basic functionality to operate and control the hardware connected to or built into the computer. The operating system (prominent examples being z/OS, Microsoft Windows, Mac OS X and Linux), allows the parts of a computer to work together by performing tasks like transferring data between memory and disks or rendering output onto a display device. It also provides a platform to run high-level system software and application software. Window systems are components of a graphical user interface (GUI), and more specifically of a desktop environment, which supports the implementation of window managers, and provides basic support for graphics hardware, pointing devices such as mouse, and keyboards. The mouse cursor is also generally drawn by the windowing system. Utility software helps to analyze, configure, optimize and maintain the computer.