Agenda What is Web? History Function of Web Basic Web entities Web Standardization Web Generations References
What is Web <ul><li>Defination-It is a hypertext system that operates over the internet.It is a global information medium which users can read and write via computers connected to the Internet.
Difference between Internet And Web </li></ul><ul><li>Internet- Collection of interconnected computer networks.
World wide web-Infinitely larger collection of interconnected documents or content. </li></ul>
I have a dream for the Web [in which computers] become capable of analyzing all the data on the Web – the content, links, and transactions between people and computers. A ‘Semantic Web’, which should make this possible, has yet to emerge, but when it does, the day-to-day mechanisms of trade, bureaucracy and our daily lives will be handled by machines talking to machines. — Tim Berners-Lee, 1999
Berners-Lee considered its problems of information presentation: physicists from around the world needed to share data, and with no common machines and no common presentation software. He wrote a proposal in March 1989 for "a large hypertext database with typed links".
1) Client makes webpage request using HTTP request msg. 2) It sends request from client to Web server Web server stores collection of web-pages created using markup language. Port 80 3) When requst arrives , server locates the requested page and send it to client using HTTP response msg. Function of Web Client (Browser) Web Server Client (Browser) Client (Browser) Internet
Basic Web Entities 1) HTML : Hypertext Markup Language It is used to create web page that is stored on web-server and provides information to client. 2) HTTP : Hypertext transfer protocol It is a protocol for transmitting web page over the internet. 3) URL : Uniform Resource Locator User types URL into browser(client) specifying the server hosting web page.
Web Standardiztion : Web standard is general term for formal standards and other technology specification that define and describe aspect of WWW World Wide Web Consortium – W3C is main international standard organization for www founded by Tim Berners-Lee in 1994. W3C standard : HTML, CSS, SOAP, XML, XSLT, Xquery, XHTML
HTML : Markup language for creating web page allows images and objects to be embedded and support intreactive forms Versions : 1) HTML 2.0 : Nov. 1995 by IETF HTML working group 2) HTML 3.2 : Jan 1997 W3C recommendation New features such as fonts tables, applet etc. 3) HTML 4.0 : Dec 1997 W3C recommendation Introduced CSS 4) HTML 4.1 : Dec 1999 W3C recommendation Just fixes bugs/error from HTML 4.0 5) XHTML 1.0: Jan 2000 W3C recommendation Reformulates HTML 4.01 into XML 6) HTML5: New generation for HTML Still in progress
Web Generations <ul><li>Web 1.0-Mostly read-only web