DNA test – means, comparing DNA samples of two, three or more sources. The comparison could be between parents and there off springs. It is also used to check appropriate parents when there is confusion in establishing proper parent relation. In crimes also its used to compare the DNA obtained from blood samples secured from the crime scene in order to match it with the suspects. What is Done in DNA test is ,the DNA is isolated from any tissue that is available from the people who are supposed to be compared. Then these different DNA samples are cut with same enzyme to create distinct banding pattern on gel. The comparison of the bands formed by the samples will reveal the closeness. Same samples will be 100% match and if the comparison is between parent and children then it will be 50%. So one can compare the banding pattern of the samples and establish there closeness.