Irregular migration is usually defined as the movement that takes place outside the regulatory norms of the sending, transit and receiving countries. Migrants with irregular status may fall under one or more circumstances. They may have entered, be residing in or are employed in a country irregularly. Law and policy reforms at the national level can change irregular migrants into regular migrants, and vice versa. The status of migrants may change during their journey and stay in the country of transit, making it difficult to create a comprehensive picture of irregular migration and the profiles of irregular migrants. This book provides comprehensive insights into the politics of migrants with irregular status in Europe. It aims to shed light on some of the unexplored aspects of irregular migration, and the recent researches in this field. This book is a complete source of knowledge on the present status of this field.