Spanish is an expanding language, every day the number of people in the world who speak it is growing. It is the mother langue of a great part of the human race and the 4th most spoken language in the world after Chinese mandarin, English and Hindi: more than 450 million people in the world speak Spanish. Nowadays it's an essential language in the professional area and its acquisition is becoming a requisite for entering into the labour market. It is the second most used language in international communication.