This guy is right on it's passed through blood lines and can't be learned by anyone outside of that blood line......However some can be taken and or given such as the sharingan but requires much more chakra from the user if they are outside of the original bloodlineya that other guy basically said it, a kekei genkai is an ability or trait that only you or your clan have, for example, haku had an elemental kekei genkai which was ice, the uchiha clan have their kekei genkai of the sharingan and so on
mind transfer = yamanaka clanhere a link on the definition:
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Some examples of KGs are:
Byakugan of Hyuga Clan
Sharingan of Uchiha Clan
Wood Element Technique of Senju
Ice Element Technique by Haku
Lava style and Vapor style of the fifth mizukage...
shadow manipulation of nara
mind transfer of inuzuka clan
body expansion of the akimichi clan
and many more.....LOL....correct me if i'm wrong though....you can also add if you have something in mind...
The Dust release is not yet known to be a KG.KG
Dust release
Secret Tech
1st hokage wood