Youtube is video platform, getting endless videos uploaded to the website everyday. The design is well made because it helps recommend videos that the viewer wants to view. Youtube uses HTML5 video elements to allow everyone to view videos, whereas Flash needs a plug-in to view. If Youtube used Flash, it could possibly turn viewers away from their platform, thus ruining their online business. Flash needs other sources to work while HTML5 can be used on any device; making videos and such more accessible to people.