The common uses of computer networks are:
(i)communication
(ii) Resource sharing
(iii) Data (or) Software sharing
(iv) Money saving
(i) Communication
Using computer networks, we can interact with the different people with each other at all over the world. It provides as powerful communication among widely separate employees, team and section. They can easily communicate at very low cost via mobile, social media, telephone, e-mail, chatting, video telephone, video conferencing SMS, MMS, groupware etc.
(ii) Resource sharing
Resource sharing means one device accessed by many systems. It allows all kind of programs, equipment's and available data to anyone via network to irrespective of the physical location of the resource of them. Simply resource sharing is sharing such as printers, scanners, PDA, fax machine and modems. For example, many computers can access one printer if it is in networks.
(iii) Sofware (or) data sharing:
Using a computer network, similarly, applications or other software will be stored at the central computer of server. We can share one software from one to another. It provides high reliable source of the data. For example, all files cannot be taken a backup or duplicate on more than one computer. So if one is not unavailable due to hardware failure or any other reason, the copies can be used.
(iv) Money-Saving:
Using the computer networking organization plays an important role because it saves money. It reduces the paperwork, manpower and save time.

The Internet Explosion
(i) Internet is simply defined as the World Wide Web connection of individual networks which operated by academic, industry, government, and private parties.
(ii)  The Internet served to interconnect with laboratories engaged at government research, and from 1994 it is expanded to serve millions of user and a multiple purpose in all parts of this universe.
(iii) In few years, the Internet built itself as a highly powerful platform that changed their way we do business and the way we communicate. Internet promotes as the universal source of information of billions of people, at work, at home, at school. Internet gave high communication medium, has given an international, "Globalised" at all dimension of the world.
(iv) Internet is growing all the time. By two things, have marked its evolution nowadays the mobile technology and social web. These two innovations have been changed the people life style to use Internet. We may find many communities in social web. Facebook was created in 2004 but gowned into world wide network all over more than 2,230 million active users.
(v) Mobile technology on hand made possible to great reach of Internet and increase the Internet user all over the world.
(vi) The Internet allows all to be democratic in mass media. Anyone can have a webpage in
(vii) Internet with very low investment. Similarly any business can reach a very large market directly, economically and fast, no matter of location or size of their business. Almost anyone that who san read and write can have a access and a presence in World Wide Web with very low investment. People everywhere can express and publish their ideas and opinions via blogging.

These social networks share several attributes in common:
Membership.
Social nets all generally requires user to register namesand accounts for avoid duplicate and secrecy so many public networks offer free registration, but some charge fees for their premium services. Private networks (such as BANK ACCOUNT HOLDERS groups) restrict registration to people who meet certain eligibility criteria.
Content contribution.
These networks allow members to easily share comments, movies, music, short films and/or photos with others.
Frequent return visits.
Healthy social net takes a centers around a base of members who check in regularly to contribute theirs and also for new updates.
Human relationship building.
The common goal of most social networks is allowing the interactions that build stronger connections with in communities of people