"Tracers" are tools or techniques used to track the movement or location of objects, substances, or individuals. They can be physical markers, like colored dyes, or digital methods, such as GPS technology. Tracers are commonly used in various fields, including environmental science, forensics, and logistics, to monitor and analyze patterns. In scientific research, tracers help in understanding processes, such as the flow of water in ecosystems or the spread of pollutants. In law enforcement, they can assist in tracking criminal activities or locating missing persons. Overall, tracers play a crucial role in gathering data and enhancing safety.