What do you mean by World Wide Web ?
World Wide Web or W3 or WWW is the leading Information retreival service of
Internet. WWW was Invented by Tim Berner's Lee in 1989. Tim Berner's Vision of
Information Management led to the development of Web which is basically containing
Information in the form of hypertext or links.
The Three fundamental Technologies related to the Web are as follows:
HTML- The language used for designing website which is hosted in Internet
URL: Uniform Resource Locator or the address of the website which is address
of any websites.
HTTP: Hyper Text Transfer Protocol which is used fro retrieval of Information
from Internet
World Wide Web got rapid acceptance when the world's first web browser was developed
called as Mosaic . However it was not only limited to Mosaic as with the coming time
after Mosaic, Netscape navigator came into existence and By the mid 1990 world wide
web occupied a massive billion base customers .
In 1995 the software giant Microsoft developed its own browser Internet Explorer
which came Integrated with Windows operating system thereby reducing competition
of browser .
Some basic Concepts related to World Wide Web.
1. Uniform Resource Locator(URL):
It is the address of any website which we search on web .It is located in
address bar of any browser you are using.for eg: www.blogger.com,
www.google.com etc etc The URL or address is basically address on
the web which basically relates to resources in the form of HTML page,
videos, images,documents.
2. Domain Name System(DNS):
Well Domain Name System is used to Translate the address of any website into
IP addressess that browsers can reload the particular resources. Each website
in the Internet has particular IP address which is in the form of numbers like
173.194.34.97. DNS eliminate the need for human to remember such complicated
numbers and thereby translate the domain you enter into computer readable IP
format .
3. Address Resolution in DNS:
When a Domain Name is Mapped to an IP address it is known as address
resolution in DNS. Steps are as follows:
1. User types the address in browser such as www.xyz.com
2. The DNS maps the address to the specific IP address on the Internet
3. This search leads to the root server which knows Information on all the
top level domains such as .com, .net , .org and other country level domains
like .au , .in , .uk
4. Root servers are located in every part of the world so it is being
automatically directed to the specific location geographically
5. After matching the correct root server it goes to the TLD also
known as Top Level Domain.TLD search for second level domain
i.e part before .com , .org.
6. The request then goes to the Domain Name server which holds
information about the site and the IP address.
7. After the IP address is discovered it is sent back to the client.
4. E-Mail Architecture:
Electronic Mail or email is used to send and receive messages in Internet
electronically.Various Companies are providing email services to users
like Gmail by Google, Rediffmail, Yahoomail, Microsoft account.
Email basically has two separated by @ symbol for example abc@gmail.com,
here abc is the username given my the user itself during making an account
and gmail.com is the domain name of the server on which the account
is created.
5. Email Architecture:
The Email architecture is composed of two parts:
1.Email Client
2. Email Server
3.Protocols like SMTP(Simple Mail Transfer Protocol) ,
POP3(Post Office Protocol Version 3)
When the user sends a mail to another user then the message is sent
to the user agents to make the sending and receiving of the mail easy.
The mail is composed and send to the Message Transfer Agents which
follows some protocols like SMTP , POP3, IMAP and then the message is
received at another terminal by Message Access Agents and then the email
goes to the User agents which receives it and provides to the end user
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