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What is the Internet?
| Tim Berners-Lee, the inventor of the
World Wide Web tells us ; |
"The Internet ('Net) is a network of networks. Basically it is made
from computers and cables. What Vint Cerf and Bob Khan did was to figure
out how this could be used to send around little "packets" of information."
"A packet is a bit like a postcard with a simple address on it. If
you put the right address on a packet, and gave it to any computer which
is connected as part of the Net, each computer would figure out which cable
to send it down next so that it would get to its destination. That's what
the Internet does. It delivers packets - anywhere in the world, normally
well under a second."
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What is the Net used for?
| Lots of different sort of programs use the Internet: electronic
mail, for example, was around long before the global hypertext system
Tim Berners-Lee invented and called the World Wide Web ('Web). Now,
videoconferencing and streamed audio channels are among other things
which, like the Web, encode information in different ways and use
different languages between computers ( protocols
) to do provide a service. |
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Is the Internet still developing?
The Internet was originally only a connection between two universities, then 3,
then 4, then more came onto the connection. Now the Internet is growing at a
ratefaster than the expansion of the connection equipment can cope.
Countries are connected by satellites or through telephone cables set into the
seabed across the oceans. Australia is one of the leading countries (per head
of population) to use the Internet. |
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What is the World Wide Web? Tim Berners-Lee
has the answers for this one;
Q: Why did you call it WWW?
Looking for a name for a global hypertext system, an essential element I
wanted to stress was its decentralized form allowing anything to link to
anything. This form is mathematically a graph, or web. It was designed to be
global of course.
Q: What is the difference between the Net and the Web?
The Web is an abstract (imaginary) space of information.
-- you find documents, sounds, videos,.... information
-- the connections are hypertext links. | On the Net,
-- you find computers
-- the connections are cables between computers; |
The Web exists because of programs which communicate between computers on
the Net. The Web could not be without the Net. The Web made the Net useful
because people are really interested in information (not to mention knowledge
and wisdom!) and don't really want to have know about computers and cables.
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What are some of the concepts behind the Web?
The world-wide web is conceived as a seamless world in which ALL information,
from any source, can be accessed in a consistent and simple way.
Universal Readership
Before W3, typically to find some information one had to have one of a number
of different terminals connected to a number of different computers, and
one had to learn a number of different programs to access that data.
The W3 principle of universal readership is that once information is available,
it should be accessible from any type of computer, in any country, and an
(authorized) person should only have to use one simple program to access
it. This is now the case. In practice the web hangs on a number of essential
concepts. Though not the most important, the most famous is that of hypertext
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What is HTML (hypertext)?
Hypertext is text with links.
Hypertext is not a new idea: in fact, when you read a book there are links
between references, footnotes, and between the table of contents or index and
the text. If you include bibliographies which refer to other books and papers,
text is in fact already full of references.
With hypertext, the computer makes following such references as easy as turning
the page. This means that the reader can escape from the sequential
organization of the pages to follow or
pursue a thread of his or her own. This makes hypertext an incredibly powerful
tool for learning. Hypertext authors design their material to make it open to
active exploration, and in doing so communicate their information and ideas
more effectively.
Although the Web uses many different formats, this is one basic format which
every Web client understands. It is a simple SGML document type allowing
structured text with links. The fact that HTML is valid SGML opens the door to
interchange with other systems, but SGML was not chosen for any particular
technical merit. HTML describes the logical structure of the document instead
of its formatting. This allows it to be displayed optimally on different
platforms using different fonts and conventions.
HTML means Hyper-Text Markup Language
You have already seen references to the Hypertext Protocol. Look at the
entry for this site at the top of this browser. See the Http:// before
the site name (the URL ) ? Well that tells the browser
that you want to connect with the site using the Hypertext Protocol or
HTTP.
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What is a Protocol for the Web (W3)? (URLs, HTTP)
The W3 project has defined a number of common practices which allow all the
clients and servers to communicate.
URLs
When you are reading a document, behind every link there is the network-wide
address of the document to which it refers. The design of these addresses
(URLs) is as fundamental to W3 as hypertext itself. The addreses allow any
object anywhere on the internet to be described, even though these objects are
accesed using a variety of different protocols. This flexibility allows the web
to envelop all the existing data in FTP archives, news arcticles, and WAIS and
Gopher servers.
HTTP
The web uses a number of protocols, then, but it also has its own Hypertext
Transfer Protocol (HTTP). This protocol includes a number of facilities which
we needed: it is fast, stateless and extensable. It also allows the web to
surmount the problems of different data types using negotiation of the data
represeentation as already described .
The other protocols which W3 clients can speak include FTP, WAIS, Gopher, and
NNTP, the network news protocol.
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How did the Internet start?
The first recorded description of the social interactions that could be enabled
through networking was a series of memos written by J.C.R. Licklider of MIT in
August 1962 discussing his "Galactic Network" concept. He envisioned a globally
interconnected set of through which everyone could quickly access data and
programs from any site. In spirit, the concept was very much like the Internet
of today.
In 1973, the U.S. Defense Advanced Research Projects Agency (DARPA) initiated a
research program to investigate techniques and technologies for interlinking
packet networks of various kinds. The objective was to develop communication
protocols which would allow networked computers to communicate transparently
across multiple, linked packet networks. This was called the Internetting
project and the system of networks which emerged from the research was known as
the "Internet." The system of protocols which was developed over the course of
this research effort became known as the TCP/IP Protocol Suite, after the two
initial protocols developed: Transmission Control Protocol (TCP) and Internet
Protocol (IP).
You can also read the History
of the Internet
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How did the Web start?
Tim Berners-Lee invented the World Wide Web in late 1990 while working at CERN,
the European Particle Physics Laboratory in Geneva, Switzerland. He wrote the
first WWW client (a browser-editor running under NeXTStep) and the first WWW
server along with most of the communications software, defining URL s, HTTP and HTML . |
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How can we help those with a disability access the
Web?
Tim Berners-Lee, W3C Director and inventor of the World Wide Web, has
this to say about access to the Internet;
"The power of the Web is in its universality. Access
by everyone regardless of disability is an essential aspect."
The World Wide Web Consortium (W3) has expended a lot of energy
to find standards that will allow access to the internet for as many people
as possible.
Web Accessibility Initiative ( WAI)
WAI Page Author
Guidelines
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