Double exposure is a photographic technique that combines two different images into a single frame. This effect can create artistic and surreal visuals by overlaying one image on top of another, allowing both to be seen simultaneously. It can be achieved in-camera or through digital editing software. In film photography, double exposure occurs when the same piece of film is exposed to light more than once. In digital photography, it can be created using software like Adobe Photoshop or Lightroom, where layers and blending modes are used to merge images creatively.