The term "Color Line" refers to the social and racial boundaries that separate people based on their skin color, particularly between Black and White individuals. It highlights the historical and ongoing discrimination faced by people of color, especially in societies like the United States, where systemic racism has created significant disparities in opportunities and rights. The concept was notably popularized by sociologist W.E.B. Du Bois in the early 20th century, emphasizing the importance of race in shaping social dynamics. The Color Line continues to influence discussions about race, equality, and justice, as communities strive to overcome these divisions and promote inclusivity.