University College London, which operates as UCL, is a public research university in London, United Kingdom. It is a member institution of the federal University of London, and is the second-largest university in the United Kingdom by total enrolment. It is a member of the Russell Group of leading research-intensive universities in the UK. UCL is known for its academic excellence and its research-intensive environment. It has a strong reputation in a wide range of subjects, including medicine, law, and the arts and humanities.