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Mass incarceration is characterized by comparatively and historically extreme rates of imprisonment in the United States, which rose drastically from the early 1970s through 2007 or so. Disproportionately affecting young, Black men from neighborhoods of concentrated disadvantage, many factors contributed to the steady increase in incarceration from the early 1970s forward. While rising crime rates and harsh societal attitudes toward those convicted of crimes played a part, scholars largely argue that increases in both the likelihood of imprisonment for committing a crime and the length of prison sentences drove the increase in incarceration. Supported by more-intensive and place-based forms of policing, individuals and entire communities faced increasing contact with the criminal justice system. Underlying these policy changes lay deeper social, political, and economic drivers, which often varied by state or other jurisdictions. Ultimately, policy changes mandating longer sentences for repeat offenses (such as three-strike laws) and state and federal laws that increased the length of prison sentences for drug-related and violent crime led to a rising incarceration rate, which meant that far more Americans were serving time and for much-longer sentences than ever before. While the rate of incarceration for men has started to decline slightly, rates for women have risen. During the first two decades of the 21st century, researchers have increasingly focused their efforts on understanding and documenting the collateral consequences of mass incarceration. Beyond the individuals directly impacted, incarceration affects the lives of children and families, neighborhoods, communities, and broader society. Individuals and families especially experience detrimental effects in the education, labor market, and health spheres, while communities suffer “spillover effects,” with even those not directly touched by incarceration affected. With nearly one in thirty-six adults living under some form of correctional supervision (whether in prison or jail, or on probation or parole), and many others “marked” by their past experience with the system, mass incarceration has touched the lives of millions of Americans. Further, racial disparities throughout each phase of the criminal justice system, including in policing, arrest, conviction, and sentencing, have resulted in Americans of color disproportionately experiencing incarceration and its attendant effects. As such, mass incarceration is understood to be a major contributor to 21st-century American inequality along lines of race, class, and gender.