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Lecture 12

COMP 1010 Lecture 12: Lecture 12

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Computer Science
COMP 1010
James E.Young

c78 http:www.umanitoba.calibrariesabouthours.html the protocol is the Hypertext Transfer Protocol (HTTP), the computer is the U of M Web server and the path is librariesabouthours.html. What makes the Web a web? The heart of Web are the Web pages: contain text, graphics, and possibly other media The use of hyperlinks, links makes them different Hyperlink: connection to some other Web page; it could be on the same Web server, or it could be anywhere on the Internet: Web Site: All of the Web pages that belong to a single organization Home page: which usually acts as a starting point that you can use to take you anywhere into the site. How to find things on the Web Search engine: lets you type in some key words, and then chooses pages that are the most likely matches to the terms you entered. The key words are known as the search terms, and the set of all the ones you type in for a particular search are known as a search phrase. Use a program called a spider to crawl through the links, to examine their contents and build up an index of the Web. The second type of Web site designed to help you find information is a Web directory: browse sites by category Advantage of Web directories over search engines: built by humans, you are less likely to find junk results in a Web directory than in a search engine. Sending data back through the Web Information that you send back to the Web server. > This kind of information is sent through a form > While forms can look very different, depending on the Web page that uses them, they generally have the same components. > In some cases, hitting Enter will also submit the form Sensitive information like credit card numbers should only be sent using a secure form. Types of data on the Web Most of the information on Web pages Web pages: special kind of document written in a language known as Hypertext Markup Language, or HTML. Some require a plugin to view Plugin: is a small program that attaches to your Web browser software to help it display documents it does not already understand Example: common plugins include Acrobat Reader and Flash Computer Usage Unit 3
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