Genetic polymorphism refers to the presence of variations in the DNA sequence among individuals within a population. These variations can occur at the level of a single nucleotide (single nucleotide polymorphisms, or SNPs) or involve larger stretches of DNA. Genetic polymorphisms can influence various traits and susceptibility to diseases, as well as response to environmental factors or medications. Understanding genetic polymorphisms can help in understanding the genetic basis of different traits and diseases, as well as in personalized medicine approaches.