DNA fingerprinting is a technique used to find out variations in individuals of a population at the DNA level . It works on the principle of DNA polymorphism, specifically identifying differences in regions called repetitive DNA or satellite DNA . These sequences produce a characteristic pattern or profile for an individual that can be used for identification in forensic applications or paternity testing . It is distinct from the study of skin fingerprints . Mastering these molecular biology definitions is a high-priority strategy, as NCERT textbooks serve as the primary source for approximately 95% of NEET Biology questions .