The Cambridge Union Society, also known as the Cambridge Union, is a historic debating and free speech society in Cambridge, England, and the largest society in the University of Cambridge. The society was founded in 1815 making it the oldest continuously running debating society in the world. Additionally, the Cambridge Union has served as a model for the foundation of similar societies at several other prominent universities, including the Oxford Union and the Yale Political Union. The Union is a private society with membership open to all students of Cambridge University and Anglia Ruskin University. The Cambridge Union is a registered charity and is completely separate from the Cambridge University Students' Union.