WWW( WORLD WIDE WEB)
Sir Tim Berners-Lee is a British computer scientist. He was born in London, and his parents were early computer scientists, working on one of the earliest computers.
Growing up, Sir Tim was interested in trains and had a model railway in his bedroom. He recalls:
“I made some electronic gadgets to control the trains. Then I ended up getting more interested in electronics than trains. Later on, when I was in college I made a computer out of an old television set.”
After graduating from Oxford University, Berners-Lee became a software engineer at CERN, the large particle physics laboratory near Geneva, Switzerland. Scientists come from all over the world to use its accelerators, but Sir Tim noticed that they were having difficulty sharing information.
- The purpose of a web browser is to bring information resources to the user.
- With an Internet Connection established, you start Web Browser.
- The browser retrieves and displays a starting Web Page.
What Is Web Address?
- Purpose URL is to search the location of web page.
- A web browser retrieves a web page using its web address.
- If you know the web address of a web page, you can type it in the Address bar at the top of the browser window.
• http://
– Hypertext Transfer Protocol
– A set of rules that defines how pages transfer on the Internet
• https://
– Hypertext Transfer Protocol Secure
– A protocol to provide an encrypted communication and secure identification of a network web server
– Often used for payment transactions on www.
• ftp://
– File Transfer Protocol
– The File Transfer Protocol (FTP) is a standard network protocol used to transfer computer files from one host to another host over a TCP-based network, such as the Internet.
What Is Web Navigation?
Surfing the web
• The activity of using links to explore the web
A link
• Can be text or an image.
Text links
• May be underlined and/or displayed in a color different from other text on the page
• The color of the link will change once the link has been visited.
What Is Web Searching?
• A primary reason that people use the Web is to search for specific information, including text, pictures, music and video.
The first step in successful searching is to identify the main idea or concept in the topic about which you are seeking information.
The Search Engine
• A program that searches documents for specified keywords and returns a list of the documents where the keywords were found.
• Requires the users to enter a word or phrase, called search text or search query.
• Each word of the search text is known as keyword.
The Subject Directory
• classifies Web pages in an organized set of categories such as sport or shopping and related subcategories.
• A subject directory provides categorized lists of links arranged by subject
• When click on the category link, the subject directory displays a list of subcategory links
• The disadvantage – users have difficulty deciding which categories to choose as the menus of links presented
• A subject directory provides categorized lists of links arranged by subject
• When click on the category link, the subject directory displays a list of subcategory links
• The disadvantage – users have difficulty deciding which categories to choose as the menus of links presented
Comments
Post a Comment