Exactly what Flash has to offer.
Video
Embedable video clips on Youtube and webpages is just yet another thing Flash is popular for. Now again, the Flash makes it no difference what OS you have - videos or animation will be rendered beautifully, the one thing you need is install the Flash player plugin.
Vector Graphics
Vector images are so popular simply because they look highly detailed and unaliased whatever the screen resolution you have or how you resize it. This is due to the fact they are not image files like .jpg or .png, but rather pieces of code that are rendered right in the web browser. When coupled with the effectiveness of a flash template, the consistent lines and crisp animation are a treat to look at.
Animated Graphics
This is without question the strong suit for Flash. Flash templates or Flash website designs look and feel a lot more live and make the website stand out from the crowd typically as a result of animation effects.
Compatibility across Platforms
Of all the popular browsers Flash templates are supported on most of them. The fundamental premise and the best thing about Flash is that an uncomplicated web browser extension makes Flash viewable in the same way across almost all of the modern web browsers, no need to say that the major ones - IE, Firefox, Google Chrome and Safari render Flash quickly.