For pokemon diamond what does it mean when they say STAB?

Question

For pokemon diamond what does it mean when they say STAB?

Answer 1

Same Type Attack Bonus. A fire Pokemon using a fire move will inflict 50% more damage; this holds true for all types of Pokemon using the same type of attack.

Answer 2

Same type attack bonus. Its 50% more damage. A water pokemon using surf will do 1.5x damage. A different type will only do 1x.