After taking a DNA test for ethnicity, many ancestry companies will give you the option to contact their other customers, providing you share sections of your autosomal DNA with them (meaning that you’re related to these individuals to a greater or lesser degree). The companies that do this maintain ‘Family Finder’ databases, and the people you’re related to are usually referred to as ‘matches’. The three largest companies that do this are Family Tree DNA, and 23andMe, and as part of the results that they provide, you’ll be able to see a list of these living relatives ranked according to how closely you’re related to them.
Y-DNA Tests: Y-DNA testing examines the Y chromosome passed only from father to son and can therefore be used to gain a better understanding of your paternal line. This can be a very interesting study for those focused on surname research, especially since the Y chromosome can give information about deep and recent roots. Because only men carry this chromosome women will need to test their father, brother or other male relation to use this test for genealogy purposes. Again, FTDNA is the leader in this type of testing and has a wealth of information, groups and forums to help.