"Do" means "Way. "Jutsu" means "Art".
Karate-Do, Judo, Kendo and Aikido are all Ways.
You first learn the Traditional art, which is what your belts are in.
You learn the Goshin modern Self defence applications.
You learn the sparring aspect and can even go on to compete in the sport version.
Do is a way to improve yourself, physically and spiritually. You train for Self defence, you don't actually train to fight. You come to realise the Way of "Fighting without Fighting".
Jujutsu, Kenjutsu and Ninjutsu are Warrior Arts.
They are combat systems warriors learnt with the intention of going into battle and killing the enemy.
