The concept of transnational migration refers to the movement by people over long distances from one country or region to another with the intention of settling temporarily or permanently in the new location. Migration occurs for many reasons, such as labor, studies, family reunion, and as forced migration due to war, conflict, ethnic cleansing, or human trafficking. The high number of persons crossing borders temporarily or permanently contributes to the current flow of ideas, capital, and objects and the fluidity and diversity of ties and exchanges across countries. This entry defines transnational migration, examines the growing field of study focused on transnational migration, and explores how transnational migration impacts both families and children.