When a visitor comes to a Web page, the raw HTML document is delivered. With this, the browser knows the recipe for the Web page is incomplete, and so it automatically requests the graphics identified in the HTML over the Internet in an implicit second pass. If the required graphics are on the same server, that's server hit number two, three, four, five and so on. As a browser user you may recognized this behavior as the HTML, or the text and the general layout of the page, loading first when you access a Web page. Then the browser fills in the graphics.
Pages are a more accurate measure of a visitor's requests and responses.
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