WHAT IS A COMPUTER?

a device, usually electronic, that processes data according to a set of instructions. The digital computer stores data in discrete units and performs arithmetical and logical operations at very high speed. The analog computer has no memory and is slower than the digital computer but has a continuous rather than a discrete input. The hybrid computer combines some of the advantages of digital and analog computers. 

The computer isan electronic devicehas the ability tomake averyhuge numberofmathematical and logical operationsin record timetoo(millions ofoperations in thefraction of a second), andis distinct fromthe human mind(which he created) that he does notget tiredorboredand do notgive up

Computer science is divided into two main categories , namely:Hardware Equipment DivisionDepartment of Software ProgramsFirst: Equipment Division (Hardware): Equipment components are perceived from the computer which can be touched by hand which electronic components , electrical or mechanical .It can also be divided into four sections:Input devices (Input):And used in data entry and information in its various forms to the computer , and a primary input (Standard Input) is the keyboard (Keyboard) and is used to enter commands and text, there are other input devices used to introduce other forms of data such as scanner Scanner to input images , a digital camera for the introduction of photos and movies , stylus to enter the signatures and handwriting and mapping , the Plotter to introduce models three-dimensional , the microphone to introduce the sounds and music , mouse mouse to enter commands by clicking or drag -and-drop (Drag & Drop), joystick joystick used to control the gaming software and is used to send commands programs for games on image electrical impulses parallel.Processing devices (Processing): Processing device is the main CPU (CPU) which is an abbreviation for the phrase (Central Processing Unit) is the CPU as a reason for humans as do most of the operations of basic computer such control in the course of the data and determine the memory addresses that must be read from or write to them and determine which units or data takes precedence in implementation and other processes , divided CPU into two main sections , namely: The control unit (CU) Control Unit: It is responsible for controlling all devices and computer data .The unit of account and logic (ALU) Arithmetic & Logic Unit: which is responsible for the performance and implementation of all logical and arithmetic operations inside the computer .* Note: ( Calculations are plus (+) and minus ( -) and division (/) , multiplication (*) ) .( Logical operations are } <,>, = <, =>, =, NOT, OR, AND, XOR {  Storage devices (Storage Device):This is the storage of data and information permanently or temporarily divided into two parts :A . Internal storage : Data is stored inside the computer itself is divided into two parts :1 . Internal storage Permanent : which is either stored in the hard disk Hard Disk Image on electromagnetic or permanent memory in the ROM image on the electrical impulses .2 . Storage provisional rules of procedure : and is in the cache memory of the RAM where the computer scans all the contents of the RAM as soon as electricity was cut off from the device , which must be completely empty the RAM when you start your computer.B . External storage : and have to save the data on floppy disks or CDs Floppy CDROM or Tape cassettes or a hard disk or a Zip Drive hard disk to save computer outside the Hard Disk.1 . Organs output (Output Device): Used to output data from the computer to the user in different forms of data.Output devices are: the screen is called a primary output Standard Output and is used to output data to a visual image , the speakers are used to output the audio data in the form of audio , the printer is used to output data on paper and through which print research , books, envelopes , envelopes, cards and many types of securities in different forms .Second, software (Software): The programs are part of the perceived non- computer world , which can not be touched by hand which is a million electrical signals and magnetic spots , the computer converts it to watch or audible data so that the user can understand and take advantage of them.The computer software is divided into three main sections :1 . Operating Systems (Operation System)Software operating systems are the most important types of programs and rely on the rest of the computer software in their work , and without the operating system computer can not work , nor can any program of the computer work without an operating system , and the system is operating the link between the user and the computer, where the system has operating on all orders which enables the user to create, open and save files and design special programs and so on.

A machine designed to help man, works with sequences of instructions and operations.

A machines which makes work easy;

 

 

 Its a machine which can be used ............ 

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Speed Brain - Storage Brain - But Cant deal with some Scientific phenomena

A brain that keep everything as long as you want.  It is a machine that will give you answers based on data that you saved in it.