Flash is Adobe's browser plug in player which plays .swf files. Flash is a vector animation software, originally designed to create animations for display on web pages. Vector graphics are ideal for the web because they are so lightweight.
In my humble opinion, I would use Flash to create a presentation that is similar to a television commercial. This type of presentation is something where the user sits back and enjoys the show as the Flash movie delivers the message to the client with animation, sound, and possibly video.