YouTube is a popular video sharing website that allows users to upload and view short videos. It was created in 2005 by Steve Chen, Chad Hurley, and Jawed Karim. The main purpose of YouTube is for users to share videos with others for entertainment, education, or other purposes. To use YouTube, one must create an account and then they can upload videos. YouTube provides advantages like educational resources and connecting people, but also disadvantages like copyright issues and cyberbullying. It has had a significant social impact by enabling sharing and connections.