If you will have no user interaction and the site's main purpose is to provide information, then plain HTML will do the trick.
Now, if there will be any kind of user interaction, such as a shopping cart or user accounts linking or something linking to a database, then PHP is very good for this.
A great example of PHP is facebook.com. The entire site is programmed in PHP and does an excellent job of keeping ***** of the small things.
Of course, then there are sites programmed entirely in flash. You could use Adobe Flash. This is a phenomenal piece of software allowing you to create entire websites in flash.
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