Sit-ins were a form of nonviolent protest commonly used during the Civil Rights Movement in the United States. The tactic involved African American individuals and supporters sitting down at segregated lunch counters, restaurants, or other public places where they were denied service based on their race.

One of the most famous sit-ins was the Woolworth's lunch counter sit-in in Greensboro, North Carolina in 1960. Four college students from North Carolina A&T State University initiated the protest, sparking a wave of sit-ins across the South.

Sit-ins were a powerful form of resistance that highlighted the injustice of segregation and drew attention to the widespread discrimination faced by African Americans. They helped to bring about desegregation in public spaces and were a key strategy in the broader Civil Rights Movement.

The courage and determination of those who participated in sit-ins played a significant role in the eventual passage of civil rights legislation that outlawed segregation and discrimination based on race in the United States.