The largest network formed by connecting computers on LANs, MANs, and WANs of the whole world through the TCP/IP is known as the internet.

It is a publicly accessible network of networks where millions of powerful servers are providing data, files, information, and other facilities to client computers.

Any four services available on the internet are:

1. WWW
2. Email, e-fax, and e-governance.
3. Chat, Video conference, Newsgroup, and telnet.
4. File transferring.

The browsers that provide facility of the internet servicesto the users is called ISP (internet service provider).
Any 3 ISPs of Nepal are:
- Mercantile Office System (MOS)
-World-LINK
-NTC

The types of internet accesses are:
-Wired access.
- Wireless access.

The websites which allows the users to search informationbased on a keywords and links the users to thewebsites with the appropriate result is called searchengine.
Any three popular search engines are:
- yahoo.com
- google.com
-msn.com

WWW is one service provided by internet which provides information about different topics or subjects.

The difference between website and web pages are:

Web browser is a program that displays pages of awebsite on the user's computer sendingthe codes ordownloading the codes of website.
Any three webbrowserare:
-Google chrome
- UCbrowser
- Opera Mini

Electronic mail is one of the popular, reliable, convenientand secureway of sending and receiving mails throughthe internet at far distance.
Its advantages are:
-It is fast,easy,reliable and secure.
- It can be used at anytime at any places.
- Also files attachment can be sent.
- The physical presence of recipientis not required.

The services of internet that enables us to send and receive instant messages by using yahoo or msn messenger is called chat.
Its advantages are:
- It enables us to send and receive messages.
- It is easy and cheap means of communication.
- It is reliable and secure.
- It allows both text and voice chatting.

Any four websites that provides e-mail services are:
- yahoo.com
-altavista.com
- google.com
-msn.com

The most advanced services of internet that enables virtualface to face communication among peoplesitting atdifferent location is called video conference.

The websites which provides facilities to the users forpurchasingand selling goods through internet is callede-commerce site.
Any three ecommerce sites are:
-www.hamrobozar.com
-www.amazon.com
-www.kinmel.com.np

The private computer network owned by a company oran organization and accessible only to its employees is calledintranet.
Any four features of it are:
- It runs onprivate networks within a network.
- It is closely related to internet.
- It serves as a powerful tools for communication within anorganization.
- It helps the employees to quickly find and view theinformations.

The task of HTTP are:
-It helps to communicate between web client and web severs.
- Itmovestherequest made by web browsers to webservers and respond the request.

The task of FTP are:
- It helps to transfer files through FTD.
- It helps to download hugeamount of data fastly.
-It helps to request file from client computers.
- It helps to provide files to client from server.

We can get following facilities fromtheinternet:
- WWW
- E-mail, chat, video conference, telnet.
- E-fax, file transferring.

a. E-mail and E-fax.

b. Internet and Intranet.

WWW: World Wide Web
URL: Uniform Resource Locator
ISP: Internet Service Provider
FTP: File Transfer Protocol
E-mail: Electronic mail
ISDN: Integrated Service Digital Network
VOIP: Voice Over Internet Protocol
Telnet: Telephone Network
IRC: Internet Relay Chat
PSTN: Public switched Telephone Network

a. Selling or buying goods on the internet.
- E-commerce

b. A private internet.
- Intranet

c. A service of internet that allows the user to post question for discussion.
- Newsgroup

d. A service of internet that allows a user to connect a remote computer.
- Telnet

e. Internet service that helps us to send and receive instant messages.
- Chat

f. A company that provides internet facilities.
- ISP

Telnet is a service of internet that allows a user to gain remote access to computer a interact with it.

Some of the examples are listed below:
a) TeamViewer
b) AnyDesk