Network, is like a group of computers that works on an environment.
Environment --> it may be offline or online, offline--> a group of computers with a major server(maintains all comp) transferring information to each computer.
eg: 6 no of computers doing programming that has been supervise by a main server.
online--> like social network, every people can interact with one other. These are some basic things about network.

How to connect your pc to a network called INTERNET?

NEED:
1. WIRED CONNECTION
2.WIRELESS CONNECTION

WIRED CONNECTION : It may be a broadband services offered by Government or private companies. eg: BSNL provides broadband connection on the basis of attractive plans.
CABLE plays a major role in communication part of wired connection, becz it transfer request/data/information from user to network service provider. Once, the service provider/server get the user's requests and they check the request is reliable or not, & they give respective web page r websites r etc.. to the user.

WIRELESS CONNECTION: means a device without any cable wires . DATA CARD is the popular in communication for transferring info in a quick time, a fraction of seconds!!. The information sends through AIR where there won't be any traffic(disturbance) at a time.
Eg: MBlaze,Tata Photon+, Reliance communication, MTS and so on..
An another eg is Mobile phones, through phones we can make a call, send a message, multimedia message. and with the use of internet connection in mobile phones, we can carry info at anytime anywhere..

so, this is about the basic concepts of NETWORK.

NEXT, 
          for communication and other purpose network concept has to follow some design principles. 
I'l tell you the design principles in a easy way!!:)

Have a great day :)

Comments welcomed!! :)

Thanks :)