Y-DNA results have no real meaning when taken on their own. The value comes in comparing your specific results, or haplotype, with other individuals to whom you think you are related to see how many of your markers match.
Since DNA testing cannot on its own identify the common ancestor that you share with another individual, a useful application of the Y-DNA test is the Surname Project, which brings together the results of many tested males with the same surname to help determine how (and if) they are related to each other.
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