Christians: How is Jesus linked with the line of King David?

I know it's not that relevant coz am a believer, but I can't help wondering why Jesus is linked with David's lineage. Joseph is from the line of King David, and is not the fether of Jesus. For Mary, mother of Jesus, I dont know if she is from that line. What puzzles me is, how is Jesus related to this... show more I know it's not that relevant coz am a believer, but I can't help wondering why Jesus is linked with David's lineage. Joseph is from the line of King David, and is not the fether of Jesus. For Mary, mother of Jesus, I dont know if she is from that line. What puzzles me is, how is Jesus related to this lineage and yet Joseph is not His father??
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