Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term ’’urban area’’ refers to high population density area, associated with towns, cities, conurbations, municipalities and megalopoli, as opposed to rural area, where population is dispersed at a low density, such as villages and hamlets. Nowadays, the issue of urbanization is more often debated as ever. For example, in the United States, almost 250 million Americans are currently living in urban areas, outpacing the nation as a whole, increasing to near 81 % during the past decade. To find out more about urban areas, its pluses and minuses, as well as urban level per country – read this book.