HTML lesson 1

 Create a Global Structure

You have previously used a Web browser to view the pages of a site. In order to make this possible, the browser must have been able to recognize not only the fact that the files you viewed were Web pages, but the browser must have also been able to identify defined containers within the file. In this topic, you will create these identifying containers and save the file as a Web page format that the browser will recognize.
Without entering the logical containers that will hold the text and graphic content of your Web page and saving your file with the correct extension, the Web browser won’t be able to recognize any of your files as Web pages. To prevent the major failure of your Web pages, you will need to identify the file as a Web page and enter these identifying containers.

The World Wide Web
The Internet is a world-wide network of computers. There are numerous ways you can communicate over the Internet: you can send electronic mail (email), transfer files, log in remotely to distant computers, and view hypertext multimedia files (Web pages). The most popular segment of the Internet is the World Wide Web (or simply“the Web”) which consists of an indescribably large quantity of Web pages. Using a software application called a Web browser, you can access and view the contents of these Web pages. A Web browser is an example of a client, which is a computer or software application that relies on another computer to complete operations. Other examples of clients that are becoming increasingly popular for accessing Web pages are devices such as cellular phones and personal digital assistants (PDAs).

The Process of Retrieving Web Pages
When you type in a Web address (or URL) into the address bar of your browser and press [Enter], your computer makes a request to a remote computer. This request is called a Hypertext Transfer Protocol (HTTP) request. HTTP is the set of standards and rules that have been implemented to allow devices such as browsers, cell phones, and PDAs to interoperate
with the remote computer that stores the Web pages that you are requesting. The remote computer that stores and processes Web pages is called a Web server. The Web server receives and processes the HTTP request from your browser, processes any scripts that may be contained
within the requested file, and then sends the file encoded with Hypertext Markup Language (HTML) to your browser, which then interprets the HTML and outputs what it interprets to your computer screen. Figure 1-1 illustrates the client-server process of requesting, processing, and receiving Web pages.


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