hey guys and gals

i need some definitions of the focusing terms please! i cant find anything to answer my questions
what does these mean?
AI Servo
AI one shot
AI focus

i dont know what they mean and what the differences are
please help :)

AI Servo is designed to track moving subjects. Birds in flight, a football player running across the field etc. The focus doesn't "lock" onto one area, it changes as the position of the subject moves. As long as you hold the shutter button half way down, the focus will continue to follow the moving subject.

In the other focus modes the focus will lock onto a static subject, and not change, until you release the shutter button and depress it half way again.

ok so only use the AI Servo for moving shots
and the rest for still shots basically?