You can play videos and images with movements and some browsers will require to have the latest version, so is important to have it updated . A lot of videos registered with .avi or .mpeg format have a very big size. This technology allow to make videos with a very good quality but with a very small size.
Note: For Firefox download non IE version. For Internet Explorer get IE x32 or x64. For Google Chrome you do not need to download. this plugin because is incorporated.