I think YouTube is one of the best app developed by GOOGLE. It lets us watch videos of people all over the world. The best feature is offline saving videos for later viewing. Now , I also use YouTube to watch news, trailers of movies , some other tech stuff and solution to my academic problems. I download these videos whenever I am having wifi and see them them at home whenever free.
YouTube has emeged to be one of the best way to connect to people all over the world and share their experiences and opinions.