A saviour is someone who pulls you out of a difficult or dangerous place — the person who saves the day. Friends use it lightly: you brought the charger I forgot; you’re my saviour. In church language, Saviour (often with a capital S) means Jesus, the one who saves people in the religious sense. The spelling saviour is British; American English writes savior, without the u. Taiwan students will meet both, and they are the same word. It is about rescue, not about putting money in a bank — that person is a saver. The everyday hook in Chinese is 救星; the church word is heavier.