Où and ou have the same pronunciation in French but they are used differently. Où means where and refers to a place, ou means or and refers ... ... <看更多>

Pascal explains in this video that the word où in French may be Where and also When in English, so how to use them to translate for example: ... ... <看更多>

This is to add to the existing answers, since I think there could be more than one reason. Keep in mind that « ou bien » is stronger than ... ... <看更多>