In the countries that are known of today, there are different types of government and there are, similarly, different types of government in Spain. Today, there are two types of government in Spain- the constitutional monarchy and democratic one too. Both play their roles where running the government is concerned though the former of the two types now consists of a royal figurehead as opposed to a king or queen who is actively involved in making laws, rules and such like that affect the government and the people of the country.
The monarchical types of government in Spain are similar to the one in the United Kingdom. The king or queen plays no active part or role in the politics of the nation and they represent the country wherever they go. These guys are constitutional heads of states and they merely appoint officials, look over reports of how the officials are running the country or what they do (whether or not they are abusing their power) and the king is considered to be the Commander in Chief of the army (referred to as the Spanish Armed Forces). He was able to suppress the Spanish coup of 1981 by using his position as the commander in chief.
The more active of the two types of government in Spain is the presidential form of government. The state has a government led by a president who is brought into government if he/she wins the general elections. The president will then appoint vice presidents and each of them are to be in charge of specific ministries in these types of government in Spain. This is unlike the forms of government in other countries where the people may vote for members of parties and the contestant that wins is then sworn in as the relevant minister.
Of the two types of government in Spain the former one is no longer as active as it used to be as its powers have been included in the constitution. Since the two types of government in Spain must run according to the constitution breach of the constitution could lead to serious consequences which is why it is important that both types of government in Spain abide by the constitution made for everyone in the country. So effectively Spain is a constitutional monarchy with a parliamentary system and both types of government in Spain exist side by side.
The days when the King/Queen could suppress the will of the Parliament or the people have gone and that is why the two types of government in Spain exist as they do now. Neither of the two types of government in Spain is allowed to breach the constitution which is made for the people of Spain and hence, the both types of government in Spain exist and run the country in their own ways. Currently the Spanish king is Juan Carlos the 1st while the prime minister is Jose Luis Rodriguez Zapatero. These are the two existent types of government in Spain today.