What is the difference between a cellar and a basement?

On this website the terms 'cellar' and 'basement' are used interchangeably to mean a room or collection of rooms that are located below (or partially below) ground level. In the UK the term 'cellar' tends to be used to describe residential projects while the term 'basement' is used to describe newbuild and commercial projects. However for all intents and purposes the terms 'cellar' and 'basement' can be taken to have the same meaning.