I think u tube is the best app in the world. Beacuse we find all solution and suggestion in youtube.if we want to know about any thing like mobile , clothes, electronics so go to youtube and and watch about the product video.its also helpfull for student if we can’t understand about any topic so go to youtube and search about topice and watchng video and understand about it.India’s number 1 technical channel is technical guruji its help me for know about techonolgy and learnt many things about techonolgy