I do not understand any of this :o Please use a noob-Language :)
I think that is n00b language but let's try:
There are 3 wires on a servo, usually red, yellow and black (or similar).
The red line is the POWER which is what turns the motor, the yellow is the SIGNAL which is what tells the servo to turn. (Black is the ground, or 0 volts, the return for the power and the signal to make a circuit.)
The POWER must come from a battery or a wall wart or similar, since the Arduino- even though the voltage is correct at 5V- cannot provide enough current (which to be very simplistic is the amount of electricity flowing, with the voltage thought of as the pressure).
The Arduino can provide the SIGNAL, and that's what the servo library is good at: it transforms your degree wishes into an electronic signal which turns the servo, with the servo POWER coming from elsewhere as mentioned.