DNA testing can help you find members of your biological family.
To find a relative using DNA, you both need to have taken a DNA test with the same company. This is where you have to get a bit lucky--but even if a person you're trying to find hasn't taken the test, a close relative of theirs may have. The good news is that DNA testing is becoming increasingly popular; there are currently 10 million people (and counting) in the AncestryDNA® database.