The Netherlands is a constitutional monarchy with a parliamentary system. This means that the government includes not only the ministers and the state secretaries, but also the monarch (currently King Willem-Alexander). The monarch is also the head of state.
The government (ministers and state secretaries) prepares and implements legislation, oversees local government, carries out the day-to-day business of government and maintains international relations.
Parliament is made up of two houses. The Senate has 75 indirectly elected members, who only have the power of veto in the legislative process. The House of Representatives has 150 members elected directly by the people.