Reclaimed asphalt pavement is a research domain focused on the characterization, processing, and utilization of asphalt materials excavated from existing pavements. This field investigates the physical and chemical properties of the aged binder and aggregate, optimal processing techniques, mix design methodologies incorporating varying proportions of reclaimed material, and the long-term performance and environmental impact of pavements constructed with it. Its significance lies in advancing sustainable civil engineering practices through resource conservation, waste reduction, and cost optimization in infrastructure development.