WWW Overview - Internet Technologies

What is WWW?

  • WWW is short form of World Wide Web which means all the resources and users on the Internet that are using HTTP.
  • Tim Berners-Lee’s organization gives the broader definition of the WWW, the World Wide Web Consortium (W3C).
  • WWW is considered as the universe of network-accessible data, an embodiment of human knowledge.
  • To keep it simple, WWW is a way of exchanging information between computers on Internet.

Do not confuse over Internet and Web considering it as a same thing. Both are different, web uses internet to send the data.

WWW Overview

Evolution

Timothy Berners Lee created WWW in 1989 at CERN in Geneva. WWW is proposed by him allowing researchers to work together effectively and efficiently at CERN making it World Wide Web.

Below diagram explains the evolution of World Wide Web:

WWW Overview

WWW Architecture

Architecture is classified into many layers as shown below.

WWW Overview

Identifiers and Character Set

Uniform Resource Identifier (URI) is used to identify the web resources and UNICODE makes it possible to built web pages that are readable and writeable in human languages.

Syntax

XML (Extensible Markup Language) helps in defining common syntax in semantic web.

Data Interchange

Resource Description Framework (RDF) framework helps to define core representation of information for web. RDF represents the data about resource in graphical form.

Taxonomies

RDF Schema (RDFS) offers standardized description of taxonomies and different ontological constructs.

Ontologies

Web Ontology Language (OWL) provides more constructs than RDFS. Below are its three versions:

  • OWL Lite for taxonomies and simple constraints.
  • OWL DL for full description logic support.
  • OWL for more syntactic freedom of RDF

Rules

RIF and SWRL supplies rules way beyond the constructs that are provided from RDFs and OWL. Simple Protocol and RDF Query Language (SPARQL) is SQL like language used to query RDF data and OWL Ontologies.

Proof

All the rules and semantics that are executed in layers below Proof with their result will be used to prove deductions.

Cryptography

Verification of the origin of sources in means of digital signature is called Cryptography.

User Interface and Applications

The top layer User interface and Applications layer is built for serving user interaction.

WWW Operation

  • It works on client-server approach. Below steps illustrates how it works:
  • Consider user entered the url (http://www.wisdomjobs.com) of the web page in the address bar of web browser.
  • Then browser asks for the IP address to the Domain Name Server corresponding to www.wisdomjobs.com.
  • Upon receiving IP address, browser then sends the request for web page to the web server using HTTP protocol which tells us the way the browser and web server communicate with each other.
  • Then web server gets the HTTP request and checks for the requested web page, if found its returns back the page to the browser and closes the HTTP connection.

Now the browser gets the web page. After interpreting it, contents are displayed in browser’s window.

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Future

Future of the web is unpredictable as there is a vast development in this field impacting every area such as education, research, commerce etc.

Even though there is a huge development in the field of WWW, there are some technical issues that W3C has to deal with.

User Interface

Working on higher quality presentation of 3-D information is still under development. The W3 Consortium is trying to enhance the web to fulfill the requirements of global communities that include all regional languages and writing systems.

Technology

Work on privacy and security is going on such as hiding information, accounting, access control and integrity and risk management.

Architecture

As there is a huge growth in field of web, it leads to overload of internet and decrease its performance. Hence, much better protocol is needed for future.

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