What is computer Information concept and processing of computer full note in English & what are hardware of computer and there parts

What is a computer

It is an electric device which can be used to carry out set of arithmetic and logical operations. A computer consists of at least one processing elements and some memory.

Data and informations

Data is a collection of items such as words, numbers, ,  etc . That are not organised. Data is processed into informations.
Information is data that is organised and has meaning and its .

Data base

Database is a collection of data that allowed access. Retride and use of that data. Without data and information and Organisation could not complete any business .

Data integrity

Data integrity is the representation II faithfulness of informations.

Data security

Data security means protecting our data from an organised Axis so it is not miss used for lost.

Data validation

Validation is the process of comparing the data to a set of rules or values to determinanes. If the data is required data validation is the process of ensuring that a program operates and clean, correct and useful data.

There are various types of data validation-

(a) Alphabetic checks-

An alphabetic checks ensure that only alphabetic data isintered  into a field.

(b) Numeric checks-

 New numeric checks ensure that only numeric data is entered into a numeric fields.

(c) Copleteness checks-

 A completeness checks verify that all required data is present.

(d) Range checks-

 Arrange checks determine whether a number is within a specified or not.

(e) Consistency checks- 

A consistency check the data entered into two or more fields to determine whether a relationship is correct or not.

Computer Hardware

The computer hardware are the parts of a computer including the central Processing Unit (C.P.U) keyboard. Monitors and drives other extra parts are called peripheral components are device include Mouse, printer, scanner , digital camera etc.

(A). Central Processing Unit (C.P.U.)

 It is the central processor of the computer system it is also called as brain of computer system it has three different units.

1. Arithmetic and logical unit
2. Memory unit
3. Control unit

These are as -

1. Arithmetic and logical unit

The Arithmetic and logical unit (A.L.U.) performs all arithmetic and logical operations of our computer. It perform addition, multiplication, division, subtraction, and other logical operation like AND, OR, NOT etc.

2.Memory Unit

The memory unit is used to store the result it also store intermediate results of processing.

3. Control unit

The control unit of the part of the the central Processing Unit works as the supervisor which controls all the instruction of the computer.

(B). Keyboard

It is a flat piece of plastic board with several button arrange on it. The keyboard is used to type information into the computer for giving instructions. There are many different keyboard layout and size available with the basic Latin language called the QWERTY layout. Basically there are 108 keys available in a keyboard.

(C). Monitor

The monitor shows information on the screen when we use type this is Called outputting of informations. It is also called as VDU visual display unit .

It can be following of many types.

• CRT -   CATHODE RAY TUBE
• TFT -   THIN FILM TRANSISTORS
• L.C.D. - LIQUID CRYSTAL DISPLAYS
• L.E.D. - LIGHT EMITTING DIODES

(D). Mouse

Computer of today using graphical user interface. In graphical user interface we work on a window which is in picture format. Mouse provide a printer on that Windows to give instruction to the computer.

(E). Scanner

Scanner allow you to transfer picture and photograph to your computer. Scanner scan the images from the top to bottom of the image one line at a time.

There are three types of scanner which are as-

1. FLAT BED SCANNER
2. SHEET FED SCANNER
3. HAND HELD SCANNER

(F). Printer

The printer takes the information from your screen and transfer it to paper. It means creates the hard copy of any information. 

There are two types of printer

1. Impact Printer
2. Non Impact Printer

These are as defined

1. Impact Printer

In these printer there is a mechanical contact between the printer head and paper.

For example- Dot matrix printer

 2. Non Impact Printer

In this printer there is no any contact between the printer head and paper.

For example- Laser jet printer & Ink jet printer.

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