Here's why:

* Genetic variation refers to the differences in DNA sequences among individuals within a population. This variation can be due to:

* Mutations: Changes in the DNA sequence that occur randomly.

* Recombination: The shuffling of genetic material during sexual reproduction.

* Gene flow: The movement of genes between populations.

* DNA polymorphisms are specific variations in DNA sequences that are common within a population. These are often used as markers for genetic studies.

* Single nucleotide polymorphisms (SNPs) are the most common type of DNA polymorphism, involving a change in a single nucleotide.

While other terms like "DNA differences" or "individual variation" are also used, "genetic variation" is the most precise and commonly used term.