16. A feed contains a list of items or entries, each of which is identified by a link. Each item can have any amount of other metadata associated with it as well.
18. Web aggregators (sometimes called portals) make this view available in a Web page; my Yahoo is a well-known example of this.
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20. When a visitor opens the page, the server processes the PHP commands and then sends the results to the visitor's browser, just as with ASP or ColdFusion.
21. When built as an Apache module, PHP is especially lightweight and speedy.
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24. CSS can also allow the same markup page to be presented in different styles for different rendering method.
27. Free-software projects that require a full-featured database management system often use MySQL. Such projects include WordPress, phpBB, Drupal &etc,.