The Commission lies at the heart of the European Union. It is supposed to be the motor of integration and, to that end, it has responsibility for proposing new policies and laws. Some have called it the 'agenda-setter'; though as we will see, it faces competition for that role.

The Commission is commonly regarded as the executive of the Union: in other words, its function is to carry out the EU's policies. However, the comparison with national executives is not exact. Although many of the founders of the European Community hoped that the Commission would emerge as a 'government' like any other, many important differences remain. In fact, one of the reasons why the Commission is such a fascinating area of study is that it has no obvious parallel as a political body: