Servo Control

Other Hardware Motors, Mechanics, Power and CNC
3

Please forgive me, (I'm completely new to Arduino and electronics) but I don't really understand the diagram.

  1. What is a 7805

  2. Where do the thin black wires coming off the servos go.

  3. how does a 9v battery become 5v

  4. what is a "boarding"

Thanks,
Drew R. Davis