Ability scores are the six natural traits that represent the basic definition of a character.
A character's muscle, endurance, and stamina. It is the prime requisite of warriors.
A character's fitness, health, and physical resistance to hardship, injury, and disease.
A character's hand-eye coordination, agility, reflexes and balance. It is the prime requisite of the thief.
A character's memory, reasoning, and learning ability. It is the prime requisite of the mage.
A character's judgment and common sense. It is the prime requisite of priests.
A character's persuasiveness, personal magnetism, and ability to lead. This ability is important to the druid, bard and paladin.