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What is Computer ?A Computer is an integrated set of data structures and algorithms capable of storing and executing programs.
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Block Diagram of Computer
Input Output
Secondary storage
Control Unit
ArithmeticLogic Unit
Primary storage
Storage Unit
Central Processing Unit : CPU
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Input DevicesKeyboardMouseScannerLight Pen/Optical PenDigital Camera , CamcorderGamepad, Joystick, Steering wheel.MicBarcode ReaderTouch ScreenWebcamBiometrics (Thumb impression / Face detection)
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Keyboard is the most common input device of a Computer System. The keyboard resembles a typewriter. Modern Keyboards have more than just the letter and numeric keys. Every single key on a keyboard is assigned a binary numbers to it which transmits that binary pattern to the computer.In Key board total 102-108 buttons
Input Devices Keyboard
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Function Key
Alphabet Key Arrow Keys Numbers KeyModified Keys
Input Devices Keyboard
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Mouse is another commonly used input device of a computer system. The mouse is a pointing device that moves the cursor on the screen. A typical Mouse has two buttons, the left and right clicking buttons and a wheel in the center for scrolling. A user can perform many operations through a Mouse, like selecting or arranging different program icons on the desktop, scroll webpages, and of course a mouse can come in handy while playing computer games.
Input Devices Mouse
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Scanner is another commonly used input device of a computer system. By using Scanner, We can get softcopy from hard copy like scan the images, documents, notes etc and can save in your Computer/Laptop.
Input Devices Scanner
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Light Pen is another input device of a computer system. By using it, we can draw complex design, take signature directly on computer and perform selection task on touch screen.
Input Devices Light Pen
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Output DevicesMonitor DisplayProjectorPrinterHead PhoneHead SetSpeakerPlotter
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Output Devices Monitor
Monitor is the most important output device of a computer system. The monitor is the display screen of a computer. Cathode Rays Tube (CRT) and Liquid Crystal Display (LCD) are the two types of Monitors.
CRT LCD
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A Printer takes print commands from a computer and print out text / images on a paper. Different types of printers are available for various purposes. Dot-Matrix, Ink-Jet, Laser-Jet are the different types of printers.
Output Devices Printer
Laser-Jet PrinterInk-Jet Printer
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Output Devices Projector
Projector is another commonly used output device of a computer system. By using projector we can project display on big screen. It is most commonly used for Presentation, Teaching, Conferences and some time we can watch movie with whole family just like theater.
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Output Devices Speaker
Speaker is an important part of a computer system. Some systems have a built-in speaker, though they are small in size. Speaker is an essential part of a computer because they can notify about various system notifications through various sounds. Big speakers, woofers & sub-woofers are used for enhance sound quality or creating a mini home theater.
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Types of SoftwareIt has three typesApplication SoftwareSystem SoftwareUtility Software
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System software sits directly on top of your computer's hardware components. This includes the operating system, drivers for your hardware devices, linkers and debuggers. Systems software can also be used for managing computer resources. System software sits directly on top of your computer's hardware components (also referred to as its bare metal). It includes the range of software you would install to your system that enables it to function
Software System Software
Windows Macintosh Unix Solaris ubuntu Redhat Fedora Kali Linux Symbian Asha Android BlackBerry
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Vice City NFS Most Wanted Counter Strike Google.com Google Maps MSN Google Earth Adobe Creative Suite VLC Media Player Skype Share It M. S. Office or Open Office or Libre Office
Unlike systems software, applications software is designed to be used by end-users. Applications software, in essence, sits on top of system software, as it is unable to run without the operating system and other utilities. Application Software is the general designation of computer programs for performing tasks. Application software includes things like database programs, word processors and spreadsheets, e-mail applications, computer games, graphics programs and such or it may be general purpose (word processing, web browsers,...) or have a specific purpose (accounting, truck scheduling, ..) Application software contrast with system software
Software Application Software
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Unless we are also programmers, we are unlikely to come across programming languages. A simple way to understand programming languages is to think of them as bricks which can be used to create applications and operating system. C++, Java, PHP and Simlab are some popular programming languages. We usually use applications on a day to day basis. These applications are themselves created using programming languages.
Software Programming Language
C Language C++ Java .Net Python Perl Hybris PHP SQL T-SQL PL-SQL
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Hardware
Monitor Printer CPU Head Phone
Modem Tablet Mouse Speaker
Laptop CPU Keyboard Pen drive
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Hardware
CD/DVD Rom Scanner Wireless
mouseWireless Keyboard
Hard Disk RAM Processor Motherboard
UPS Pen Drive Dongle USB Bluetooth
