This document provides an overview of the history and development of prisons and imprisonment. It discusses how prisons emerged from institutions designed to contain the poor in the 16th century. Major reformers in the 18th-19th centuries advocated for more humane treatment of prisoners. The 19th century saw the rise of the penitentiary system with solitary confinement intended for prisoner reform. Overcrowding, human rights issues, and the social costs of mass imprisonment are ongoing concerns today.