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When you encounter Flash content in a web page, what you see is actually an external file called a Flash movie. A Flash movie is a file with the suffix .swf, and it plays through the Flash Player.
A Flash movie can be anything from a simple button with a hyperlink to a complete web experience with buttons, pages, videos, audio, dynamic content, and links to internal and external pages. All Flash movies are created using the Adobe Flash application, and they cannot be altered after they are compiled into an SWF file.