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 file size, appealing to the eye and fun.
Why Use Flash?
Flash movies can load faster and save on download time because Flash is vector based whereas HTML is not. However the more graphics and scripting you add into a flash movie may make it load slow.
Flash intelligently ‘caches’ it’s movies so they don’t have to be reloaded. Once loaded into your computer you can play it over and over.
Flash gives the user (the person viewing/using the Flash movie) a more responsive ‘rich-client’ like experience. Flash can be an interactive scene or a movie that just plays. Depends on what your needs are.