The word pacific refers to people, actions, and ideas that are peaceful. Pacific actions promote and create peace.
A pacifist is a person who opposes all wars, and that word can help you remember that pacific things are also peaceful. All pacific things are done in a peaceful way or help the cause of peace. Protesting a war is pacific. Signing a peace treaty is pacific. The philosophy of being pacific is called pacifism. Don't confuse pacific with a small "p" with Pacific with a big "P" — as in the Pacific Ocean.