theguardian.com, formerly known as Guardian Unlimited and guardian.co.uk, is a British news and media website owned by the Guardian Media Group. It contains nearly all of the content of the newspapers The Guardian and The Observer, as well as a substantial body of web-only work produced by its own staff, including a rolling news service. As of November 2014, it was the second most popular online newspaper in the UK with over 17 million readers per month; with over 21 million monthly readers, Mail Online was the most popular.