This chapter reviews the economic literature on migrants' remittances, focusing on both micro and macroeconomic aspects. At the micro level, the chapter discusses various motivations for remitting, including altruism, exchange, strategic behavior, insurance, and family loan arrangements. Empirical evidence suggests that a combination of individualistic and familial motives explains the likelihood and size of remittances. At the macro level, the chapter examines the short-run and long-run impacts of remittances. Short-run effects are analyzed through standard Keynesian and trade-theoretic frameworks, while long-run effects are explored using an endogenous growth model. The chapter also explores the relationship between remittances and inequality, noting that this relationship is non-monotonic. The analysis highlights the complex interplay between migration, remittances, and economic development, emphasizing the unique context of developing countries where remittances play a crucial role in addressing poverty, inequality, and income volatility.This chapter reviews the economic literature on migrants' remittances, focusing on both micro and macroeconomic aspects. At the micro level, the chapter discusses various motivations for remitting, including altruism, exchange, strategic behavior, insurance, and family loan arrangements. Empirical evidence suggests that a combination of individualistic and familial motives explains the likelihood and size of remittances. At the macro level, the chapter examines the short-run and long-run impacts of remittances. Short-run effects are analyzed through standard Keynesian and trade-theoretic frameworks, while long-run effects are explored using an endogenous growth model. The chapter also explores the relationship between remittances and inequality, noting that this relationship is non-monotonic. The analysis highlights the complex interplay between migration, remittances, and economic development, emphasizing the unique context of developing countries where remittances play a crucial role in addressing poverty, inequality, and income volatility.