Sit-ins were a form of nonviolent protest popularized during the Civil Rights Movement of the 1960s. African American activists would gather and sit-in at racially segregated facilities such as restaurants, lunch counters, and public spaces reserved for whites only. The purpose of the sit-ins was to challenge segregation laws and promote integration by peacefully occupying spaces that would typically exclude Black individuals.

One of the most famous sit-ins occurred in February 1960 at the Woolworth's lunch counter in Greensboro, North Carolina. Four African American college students, later known as the Greensboro Four, sat at the whites-only counter and refused to leave until they were served. Their peaceful protest sparked a wave of sit-ins across the South, leading to the desegregation of many public facilities.

Sit-ins played a significant role in the Civil Rights Movement, showcasing the power of nonviolent resistance in challenging racial discrimination and segregation. The courage and determination of those who participated in sit-ins helped to bring about important strides towards racial equality and justice in the United States.