Social policy is how a society responds to social problems. Any government enactment that affects the well-being of people, including laws, regulations, executive orders, and court decisions, is a social policy. In the United States, with its federal tradition of shared government, social policies are made by governments at many levels—local, state, and national. A broad view of social policy recognizes that corporations and both nonprofit and for-profit social-service agencies also develop policies that affect customers and those they serve and therefore have social implications. Social policies affect society and human behavior, and their importance for social-work practice has long been understood by the social-work profession. Modern social welfare policies, which respond to basic human needs such as health care, housing food, and employment, have evolved since their introduction during the New Deal of the 1930s as responses to the Great Depression. In the aftermath of the recent “Great Recession” that began in 2006, the nation has once again experienced the kinds of social problems that led to the creation of innovative social welfare policies in the 1930s. How policy makers respond to human needs depends on who has the power to make policy and how they conceptualize human needs and the most effective ways to respond to them. In the early 21st century, the idea that the state should guarantee the welfare and well-being of its citizens through progressive welfare state policies and services has few adherents among policy makers. The complex social problems resulting from the recession—the highest unemployment since the Great Depression of the 1930s, escalating budget deficits at all levels of government, an unprecedented housing crisis exemplified by massive foreclosures, increasing social and economic inequality, a nation polarized by corrosive political conflict and incivility—create a context in which social policies are debated vociferously. Social workers, long committed to the ideal of social justice for all, are obligated to understand how policies affect their practice as well as the lives of those they serve and to advocate for policies that will improve social well-being as the United States recovers.