What is $DNA$ polymorphism? Why is it important to study it?

(N/A) $DNA$ polymorphism refers to the occurrence of genetic variation at a specific locus in a population,where more than one variant (allele) exists with a frequency greater than $0.01$.
It arises due to mutations that are inheritable.
Studying $DNA$ polymorphism is important because:
$1$. It serves as a powerful tool in forensic science for individual identification.
$2$. Since these variations are inherited from parents to offspring,they form the basis of $DNA$ fingerprinting,which is crucial for paternity testing and resolving legal disputes.