From the Greek word meaning "glory," a kudos is acclaim for exceptional achievement or qualities.
On the RP repository, receiving a kudos means that another community member recommends you as someone other people might like to get to know. Perhaps because you are exceptionally fun to RP with, exceptionally fun to know, or are just plain exceptional!
Even thought I've only just met them, I've come to admire their style and cannot help but give credit where it's due! Alongside their long 4-5 paragraph responses, their character personalities are acted out quite well, and they're very helping in planning out scene's and idea's! Definitely a friend worth having! - Azelforest