To set the stage for the next chapter on markup algebra, we must introduce fetching a page from the Web and mapping the page into structures compatible with the WebL language. Although we cannot give a thorough overview of the Web protocols and formats involved in this process, we present a short tutorial to introduce the particular vocabulary used in WebL. Thus the most of this chapter is a review of things that might be known to many readers. However, the chapter does contain important information and definitions that will be required in the following chapters.