WHY THE PEOPLE IMMIGRANTS?

Human migration, based on the migration of human populations has two meanings: a broad, including all types of movements of human beings, and other, more restricted, it only takes into account those translocations involving a change of residence of those performing. 
Immigration is the arrival in a country of people from other country or place. 
The most important way from the nineteenth century to the present day migration is known as rural exodus, which is the massive displacement of population from rural to urban, millions of people move annually from rural to urban areas across countries of the world (especially in developing countries) in search of better living conditions and, above all, greater employment opportunities.