Attack: Higher it is the more likely you'll hit and the wider range of melee weapons you can use.
Strength: The higher it is the higher the amount of damage you can inflict.
Defence: The higher it is the less likely you'll be hit and the wider range of armour you can wear.
Pop Decay wrote:
I always thought attack was how fast you hit, strength was how hard you hit, and defence was how others hit you.
Depending on what weapon is being used, everyone hits at the same speed, regardless of their Attack level.