Most business websites these days are dynamic meaning that the web pages are dynamically built pages that allow user interaction. This is required for example for an online shopping cart. They are usually built with a programming language such as ASP, PHP or JAVA. This code "creates" the HTML that is displayed in the browser. XHTML and XML are standards which are probably eventually replace HTML. However most sites are still "output" in HTML because this is visible in most browsers.

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