Sola fide means "faith only" in Latin. It is used by Protestants, who believe that people must trust Jesus to bring them back into relationship with God. Sin creates a gap between people and God, but Jesus, who was perfect, died by taking the punishment for sin for the people and so bridged the gap. That is called salvation because Jesus "saves" people from being without God. The idea is that trust in Jesus is the only way to be saved and to get to heaven after people die.
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