With static web sites, requests for pages are handled by a web server delivering the content of these HTML files, "as is". They are called static because they don't change very often. With dynamic web sites there is a difference, requests for pages are a bit more complicated. For each request, the page (the HTML) is constructed from information stored in files (such as images), information stored in databases (textual content) and programming logic (both server side such as PHP, Java, ASP etc and with "Web 2.0" more client side - Javascript). All really useful sites (Amazon, Trademe, online banking etc) are dynamic. It would be completely impossible for them to be anything else, as what they are providing is constantly changing and/or the content is dependent on what the site visitor actually asked for.
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