A genetic marker is a measurable feature in DNA that researchers can use to identify or track a particular region of a genome. A marker may be a small DNA sequence variation; it does not have to cause a trait itself. When a marker is reliably associated with an inherited characteristic, it can help researchers follow that trait through breeding or genetic studies.
In crop research, markers can help breeders identify plants likely to carry useful traits, such as resilience to environmental stress, without relying only on visible characteristics. In cyber security, genetic markers are not attack tools, but the data containing them can be sensitive: genomic records may reveal information about individuals or populations. Protecting such data with access controls, secure storage, and careful sharing practices helps preserve privacy and the integrity of research.