Browsing the Web
The Web, as you know it, is simply the interaction between two different systems trying to exchange data. The system that is trying to fetch a web page is known as the client. The client system usually runs a program called a web browser, such as Safari, Firefox, Internet Explorer, Opera, and so on. This is the extent of the Web that you're used to using every day. The web browser provides navigation buttons and bookmarks and is responsible for drawing web pages on your screen.
On the other end of the Web is a system known as the web server. This system takes the client's request for a page, retrieves the page from a local disk, and sends it to the client—your web browser. This interaction is shown in Figure 21.1.