Faith is belief with strong confidence; strong belief in something for which there may be no substantial proof; complete trust in or devotion to. Faith is contrary to doubt.
Faith is self-belief or trust in a person, thing, deity, or in the doctrines or teachings of a religion or view. It can also be trust that is not based on proof. The word faith is frequently used as a replacement for hope, trust or belief.
In religion, faith often engages allowing claims about the character of a deity, nature, or the universe. While some have quarreled that faith is opposed to reason, proponents of faith disagree that the proper domain of faith concerns questions which cannot be settled by proof.