There are more than 215 million international migrants in the world. Recorded remittances received by developing countries, estimated to be US$325 billion in 2010, far exceed the volume of official aid flows and constitute more than 10 percent of gross domestic product (GDP) in many developing countries. Migration and remittances factbook 2011 provides a comprehensive picture of emigration, skilled emigration, immigration, and remittance flows for 210 countries and 15 country groups, drawing on authoritative, publicly available data. The current edition of the factbook updates the information in the popular 2008 edition with additional data for 71 countries collected from various sources, including national censuses, labor force surveys, population registers, and other national sources. In addition, it provides selected socioeconomic characteristics such as population, labor force, age dependency ratio, gross national income (GNI) per capita, and poverty headcount for each country and regional grouping. More frequent and timely monitoring of migration and remittance trends can provide policy makers, researchers, and the development community with the tools to make informed decisions. The factbook makes an important contribution to this effort by providing the latest available data and facts on migration and remittance trends worldwide in a comprehensive and readily accessible format.