A genetic marker is a specific sequence of DNA that can be used to identify individuals or species. These markers can be found in various locations on chromosomes and may be associated with particular traits or diseases. Scientists often use genetic markers in research to track inheritance patterns and understand genetic diversity. Genetic markers are crucial in fields like genetics, medicine, and forensics. In medicine, they can help identify individuals at risk for certain conditions, while in forensics, they assist in matching DNA samples to suspects. Overall, genetic markers play a vital role in advancing our understanding of genetics and its applications.