When you would need to build dynamic web sites?
Static web pages (normal pages you build) always look the same and the content never changes unless you load a new page or you change the page yourself and upload the new version of the page to the web server.
Dynamic pages do the opposite, they can change every time they are loaded (without you having to make those changes) and they can change their content based on what user do, like clicking on some text or an image.
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