This service revolutionized the world. It gives you many options, like listening to music, learning new things even wathing some movies. But because it is public service and everyone can upload their videos on it, it has so many garbage videos. When you search some term, before you open the video that you actually want, you first open bunch of crap videos. And there are commercials, they are so annoying and when listening to playlist every few videos on start have commercial. But this web application has become synonim for videos on internet.