Youtube ia a very good and usefull application. It is a application which provides lot of information in a daily life we can watch the online movies and find whichever videos we like I watch and ur as a search option to find what we would like to watch abd it as a option to set the quality of a video and to save the data.
We can study the course which we need which are published by some authors in youtube channel which is much helpfull and it as the option that we can upload our own video also which you want to share with most of the people in online.it is a good app developed by steve chen