Internet – Part II

What is the World Wide Web? The World Wide Web is a collection of host machines, which deliver documents, graphics and multi-media to users via the Internet.

World Wide Web Pages or files are stored on Web Servers. Users access these pages using a graphical browser like Netscape Communicator or Internet Explorer. Pages can include graphics, sound, movies and other media-rich content, as well as references to other pages on the same site or other sites.

Hyper-Links A hyperlink is a clickable link to another document or resource. It is normally shown in blue underline. When a user clicks on this link, the client will retrieve the document associated with that link, by requesting the document from the designated server upon which it resides.

URLs An URL (Uniform Resource Locator) is a means of specifying the pathname for any resource on the Internet. It consists of three part: a protocol part a host part  a document name

URLs Computer_Science/index.htm specifies the protocol as http, the host or WWW server as just.edu.jo and the document as /Computer_Science/ index.htm

Search Engines Because there is so much information available on the Internet today, it is important to be able to access information quickly. Several sites have specialized in searching

Browsing the Web The features of World Wide Web (WWW) are: Server provides access information presented as pages uses html (hyper-text markup language) to write it.

 Pages may reference other pages, graphics etc (links)  Client provides browse services to view pages and handle special page types  Connect only long enough to get a page  Examples of available browsers include Netscape Communicator and Internet Explorer. Browsing the Web

HTML HTML: Hyper Text Markup Language. Used to create (design) Web pages which may include text, graphics, sound, video and/or links to other pages.

Web Browser A WWW browser is an application run on a user’s computer, which allows him to view the pages made available by a WWW server. The browser interprets each HTML page and displays the information in a window. Each WWW server has a host name, and each page has a location address where it resides on the server.

The site-name is which denotes the server address for the WWW server at JUST. The page, which is shown as JUST’s home page is called index.htm Web Browser