The purpose of a DNA test is to tell you where your line differs from another. Everyone's DNA is 99.9% similar to everyone elses and we are all related, so it is the differences we seek. We want to discover who our relatives are within a genealogically useful time frame and exclude all the rest. | The purpose of a DNA test is to tell you where your line differs from another. Everyone's DNA is 99.9% similar to everyone elses and we are all related, so it is the differences we seek. We want to discover who our relatives are within a genealogically useful time frame and exclude all the rest. |