Flash was very big for a long time, people paid large sums of money to have their home page created in Flash because you could do all sorts of “cool” things with it.
But Flash does not work on iPhones and many other smartphones and now that the percentage of website visitors using smartphones has dramatically increased, more and more people will see results in Google like the image you see on the left warning users that the site may not work on your phone.
When you are creating a new website, don’t let anyone convince you that Flash is the way to go…. it’s not. There are better, cheaper and easier ways to attract attention without alienating a large percentage of your visitors.