Increasing interconnections between nation-states across borders have made the transnational a key tool for understanding our world. It has made particularly strong contributions to immigration studies and holds great promise for deepening insights into international migration. This is the first book to provide an accessible yet rigorous overview of transnational migration, as experienced by family and kinship groups, networks of entrepreneurs, diasporas, and immigrant associations. As well as defining the core concept, the book explores its implications for immigrant incorporation, and its relationship to assimilation. By examining the political, economic, social, and cultural dimensions of transnational migration, the authors capture the distinctive features of the new immigrant communities that have reshaped the ethno-cultural mix of receiving nations, including the US, Canada, Australia and Western Europe. Importantly, the book also examines the effects of transnationality on sending communities, viewing migrants as agents of political and economic development. This systematic and critical overview of transnational migration perfectly balances theoretical discussion with relevant examples and cases, making it an ideal book for upper-level students covering immigration and transnational relations, on sociology, political science, and globalization courses.