Ground-penetrating radar (GPR) is a technology that uses radar pulses to image the subsurface of the ground. It sends high-frequency radio waves into the earth, which bounce back when they hit different materials, like rocks, soil, or buried objects. This helps scientists and engineers see what lies beneath the surface without digging. GPR is useful in various fields, including archaeology, where it can locate ancient artifacts without disturbing the site. It's also employed in civil engineering to assess the condition of infrastructure like roads and bridges, helping to identify issues before they become serious problems.