Over the past decades an increasing number of countries have developed a growing interest in attracting and retaining skilled and highly skilled migrant workers. This chapter provides an introduction into the nature and dynamics of the global skill market and the role of states and state policies in international migration processes of highly skilled workers. This introduction also outlines the subsequent chapters of this volume which address questions regarding (i) the nature and scope of high-skilled migration and ‘immigration policy packages’ states implement to attract and select high-skilled migrants; (ii) the rationales and determinants of high-skilled migration policies evolving over time and space; (iii) the extent to which policies and other drivers affect high-skilled migration processes in general, and international migration of students, scientists, and health professionals in particular.