The term "blind faith" refers to a belief or trust in something without any evidence, proof or rational reasoning. It is often associated with religious or spiritual matters where people believe in a higher power or divine being despite lacking tangible evidence for their existence. The phrase suggests that the individual has put their complete trust and confidence in an idea, concept or person without having any concrete knowledge to back up their beliefs. In essence, it means believing something wholeheartedly even when there is no logical basis for doing so.