An elf is a member of the elven race. The elves are a culture superior to that of the humans of Halkeginia, yet inferior to the humans of Saito's world. Their magic is fundamentally different from that of Halkeginian mages.
If one looks at a certain stand point the elves are typicially arrongant and extremely bigoted to the point of looking down on their foes. This is weakness as their culture is more vulnerable to human of saito's world power. They are so arrogant they call human barbarians and are even prideful when cornered as shown with bishadil and joeseph.