What
is computer?
A computer is an electronic device that
manipulates information, or data. It has the ability to store, retrieve, and
process data. You probably already know that you can use a computer to type
documents, send email, play games, and browse the Web.
A computer contains many electrical, electronic and
mechanical components known as hardware :-
·
Input
device - keyboard, scanner, mouse
·
Output
device - printer, monitor , headphone
·
Storage
device – ROM , RAM
·
System
unit – Motherboard
·
Communication
device – Wi-Fi , Bluetooth
Green
computing :-
Green computing is the environmentally responsible and eco-friendly use of
computers and their resources. In broader terms, it is also defined as the study
of designing, manufacturing/engineering, using and disposing of computing devices in
a way that reduces their environmental impact.
Network :-
A network is defined as a group of two or more computer
systems linked together. There are
many types of computer networks, including the following:
·
Local-area networks
(LANs): The computers are geographically close together (that is, in the
same building).
·
Wide-area networks (WANs): The
computers are farther apart and are connected by telephone lines or radio
waves.
·
Campus-area networks (CANs): The computers are within a
limited geographic area, such as a campus or military base.
·
Home-area networks (HANs): A network contained within
a user's home that connects a person's digital devices.
Internet :-
The Internet is a global network connecting
millions of computers. More than 190 countries
are linked into exchanges of data, news and opinions.
Is Web and Internet the
Same?
The Internet is not synonymous with World Wide Web. The Internet is a massive network of networks, a
networking infrastructure. It connects millions of computers together globally,
forming a network in which any computer can communicate with any other computer
as long as they are both connected to the Internet. The World Wide Web, or
simply Web, is a way of accessing information over the medium of the Internet.
It is an information-sharing model that is built on top of the Internet.
Computer software :-
Computer software, or simply software, is that part of a computer system that consists of encoded information or computer
instructions, in contrast to the physical hardware from which the system is built.
Computer application in society :-
·
Science
·
Publishing
·
Travel
·
Manufacturing
Computer application in society :-
· Education
· Finance
· Government
· Healthcare
Element of information system :-
· Hardware
· Software
· Data
· People
· Procedure
A super computer :-
A super computer is a
computer that performs at or near the currently highest operational rate of computers.
Example – used for scientific and engineering application that must handle very
large database or do great amount of computing.
Embedded Computer :-
An embedded computer is a
special purpose computer that function as a component in a large product
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