A "Trace (Mark)" refers to a visible or detectable sign left by an object or person. This can include footprints, tire tracks, or any other marks that indicate movement or presence. Traces are often used in various fields, such as forensic science, to gather evidence about past events or actions. In the context of forensic investigations, traces can help reconstruct a scene or identify suspects. For example, analyzing shoe prints can provide information about the type of footwear and potentially link a suspect to a crime. Overall, traces serve as important clues in understanding what has occurred in a specific location.