UNIT-3

WWW: (world wide web ) :

The www  is an internet system used for creating, displaying, linking hypertext or multimedia files over internet. It is a large part of internet but not whole internet.

It is collection of web sites and web pages linked via special links called hyperlinks

WWW was purposed between 1989-1991  by Tim Berners Lee

The other services on internet: ftp, gopher, mail, news etc. used to collect information but it is not the part of WWW

Internet :

Is computer based world wide information network.

It is composed of large no of smaller interconnected networks

Website: website is a collection of web pages. It is a location on  internet server.

Web portal: It is a website  having hyperlinks to many other websites.

Home page: It is the top level web page of a web site. This is the page that gets displayed first of all when a web site is opened

URL: Each website has a unique address on internet  called URL:Part of URL : Type://address/path  

IP address: unique numeric address of each device on internet. String of numbers separated by dots.

Web server: It is a special type of server that can handle http request. Example of web servers: IIS, tomcat, WebLogic etc.

Web client: The request for web services or websites or webpages. All web browsers are example of web clients.

Web Browser : It is a software that is used to explore web sites. Text only browser: access web in text only mode e.g. Lynx

            Graphical Browser: that can access web with multimedia contents(text, audio and video). E.g. Firefox , Opera ,            Chrome, Mozilla, Internet Explorer, Net scape

Web hosting is the business of housing, serving, and maintaining files for one or more Web sites.

Web hosting is a service that allows us to put a website or a web page onto the Internet, and make it a part of  the World Wide Web.

The  business of providing storage space and access for websites on the internet. Websites are hosted, or stored, on special computers called servers.

When Internet users want to view your website, all they need to do is type your website address into their browser. Their computer will then connect to your server and your webpages will be delivered to them through the browser.