The term "mirage" can refer to a few different concepts depending on the context: 1. **Optical Illusion**: In the most common sense, a mirage is an optical phenomenon that occurs when layers of air at different temperatures create a distortion in the way light travels. This often results in the appearance of water or a reflection of the sky on a hot road or desert surface. The light refracts due to temperature gradients and creates an image of something that isn't actually there.

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