Genetic markers are specific sequences of DNA that can be used to identify individuals or species. They serve as indicators of genetic variation and can help researchers track inheritance patterns, study genetic diseases, and understand evolutionary relationships. Common types of genetic markers include single nucleotide polymorphisms (SNPs) and short tandem repeats (STRs). These markers are valuable in various fields, including medicine, forensics, and agriculture. In medicine, they can help identify individuals at risk for certain diseases, while in forensics, they assist in matching DNA samples to suspects. In agriculture, genetic markers can be used to select desirable traits in crops and livestock.