"The Managed Heart" is a book by sociologist Arlie Russell Hochschild that explores the concept of emotional labor, which refers to the process of managing feelings and expressions to fulfill the emotional requirements of a job. Hochschild examines how workers, particularly in service industries, are often expected to display certain emotions, leading to a disconnect between their true feelings and the emotions they project. The book highlights the impact of emotional labor on workers' well-being and personal lives. Hochschild argues that this labor can lead to emotional dissonance, where individuals feel pressure to suppress their genuine emotions, ultimately affecting their mental health and relationships outside of work.