<human>:  In the Constitution of the United Kingdom, what is the difference between the House of Commons and the House of Lords?
<bot>: The House of Commons is elected by the people, and the House of Lords is appointed by the king. The House of Lords is the upper house of the UK Parliament, and it is made up of members of the British aristocracy. The House of Commons is the lower house of the UK Parliament, and it is made up of members of the British people.