WWW, BROWSER SEARCH ENGINE

Mrs. Vasanthi Muniasamy

The World Wide Web

Do you know what is WWW?

Yes, WWW is the short form of the World Wide Web. In short we call it the Web.

Tim Berners-Lee, a scientist at CERN, invented the World Wide Web (WWW) in 1990. The basic idea of the WWW was to merge the complex Internet technologies into easy to use global information system.

Web SiteA site or area on the WWW or World Wide

Web that is accessed by its own Internet address is called a website.

It can be a collection of related Web Pages.Each web site contains a home page and

may also contain additional pages.It is owned and updated by an individual,

company, or organization.The Web is a dynamically moving and

changing entity, many web sites change on a daily or even hourly basis.

Web PageA Web page is as one area of the www. Web site or document on the web is a

page.It can be an article, an ordering page, or a

single paragraph, and it usually a combination of text and graphics.

Home PageIt is the web page that your browser uses when it starts, andAlso the web page that appears every time you open your browser. It also refers to the main web page out of a collection of web pages.

HypertextThe Motion of the Web

Hyperlinks connect web pages

Hyperlinks can be text or graphics

Hyperlinks can be anywhere on the page

Point to a link …

Click the left mouse button

Pictures -- Photos, cartoons, exaggerated letters, and other designs. Each of these images is a link to some other page:

Using Internet- Navigating Across the Web Pages

Type the URL of a website in the address bar and press Enter.

The Menu bar options help you work with different setting options.

The Status bar displays the status of the page being loaded.

You have already learnt that a browser helps you to locate the Web pages. Let’s have a glance of the main features of a browser window that help you to locate as well as navigate across the Web pages.

Navigation and Reload Buttons

Recall when you first visited your friend’s house. You could easily locate his house with the help of the address.Similarly, you need to provide the URL (Uniform Resource Locator) of a website in the browser’s address bar.

Using Internet- Opening Web pages using URLs

Example of a URL:

Understanding the URL:

• http stands for Hypertext Transfer protocol which is a request/response between an end user (you) and the server (Web site). http remains common for most of the websites. URLs that start with https denote to be a secure website.

• google.co.in stands for the domain name. This name is followed by a slash (/) if you intend to open a page within the domain name.

So you need to have a proper URL of a Web site to open it in a browser.

URLUniform Resource Locator is a fancy term for the address of a World Wide

Web page or other resource.Used to identify web pagesExample: http://www.vbs.com/welcome/main.html

The first part is protocol “http://”

Second is host name (name.domain name)

This name identifies the web site containing the page.

The term "domain name" usually refers only to the last part of the host name, in this case “vbs.com”, which has been registered for that particular company's exclusive use.

The 3rd part of the URL “welcome/main.html” is the path at which this particular web page is located on the web server.

Domain Name System

.com it is used for commercial websites. They earn money from advertisements e.g. www.yahoo.com

.edu it is used for educational websites e.g. www.lums.edu.pk

.gov Government institutions www.hec.gov

.org Non-profit organizations www.drasat.org

.mil Used for military websites e.g. www.usa.mil

.net Networking organizations. It represents an organization that is working on network www.a1vb.net

.ca

.th

.sa

Canada www.mov.edu.caThailand www.lic.edu.thSaudiarabia www.kku.edu.sa

Using Internet- Web Browsers

A web browser or browser is a software application that helps you to browse or locate and display the Web pages. These Web pages may contain text, images, music, videos, games, etc.

The most common Web browsers are:

Internet Explorer

NetscapeOperaSafari

Google ChromeMozilla Firefox

Internet Browser

You can install these software applications on your computer system. After the installation is complete, you can find a small browser icon on your desktop. Next time when you want to open the browser, you can simply click on the icon.

Following is an image of a Web browser window:

Using Internet- Web BrowsersContinued…

Searching- Search Engines

We search for something when we don’t know its exact location. Likewise, if you don’t know the URL of a specific Web site, you have to search for it. You cannot use a browser’s address bar to search for the information or a Web site.

Then, how do I search for any information?There are tools called Search Engines which help you to locate the information you want.

Following is an image of some common types of search engines: