YouTube is a website.
YouTube is an American video-sharing website headquartered in San Bruno , California . The vast majority of its videos are free to view , but there are exceptions , including subscription-based premium channels , film rentals , as well as YouTube Red , a subscription service offering ad-free access to the website and access to exclusive content made in partnership with existing users . , the website is ranked as the second most popular site in the world by Alexa Internet , a web traffic analysis company .