Google Analytics "Paid Keyword Report" (not set)

Trying to find out what "not set" means in my Google Analytics paid keyword report. Thanks for any help!

 

it means for some reason or another it did not capture the keyword. You'll find it for other measurements as well, i.e. city or region.

 

Probably traffic from other sources outside of adwords. Maybe you're getting a lot of organic traffic?

 

exactly, or traffic they cant track the keyword on for search network partners

 

Thanks for the answers, much appreciated, +rep's