"Bowling Alone: The Collapse and Revival of American Community" is a book by sociologist Robert D. Putnam that explores the decline of social capital in the United States. Putnam argues that Americans are increasingly disconnected from family, friends, and civic organizations, leading to a decrease in community engagement and participation in group activities, such as bowling leagues. The book highlights the consequences of this social isolation, including reduced trust among individuals and weakened democratic processes. Putnam also discusses potential solutions for revitalizing community connections, emphasizing the importance of fostering social networks and encouraging civic involvement to rebuild a sense of belonging.