Some lucky people have a photographic memory: they glance at a page, a scene, a number, and store a perfect mental image they can read back at will, like a camera in their head. Detectives and geniuses in fiction have it, and most of us are quietly jealous.
There is no verified case of a true photographic memory in any adult, in the sense of storing and recalling an image with perfect, lasting detail. Researchers have hunted for it for decades and never confirmed it under controlled conditions; the closest thing, eidetic imagery, is a brief and imperfect ability found in a small fraction of children that fades with age and is nothing like a flawless photo. People who perform astonishing feats of memory, the world-champion memorisers, almost always rely on trained techniques like the method of loci, not an inborn camera. There are rare exceptional cases, like people with highly superior autobiographical memory who recall their own past in remarkable detail, but even they are not error-free image-storers. So the photographic memory is essentially a myth dressed up by movies. Some memories are extraordinary, but they are built with tricks and effort, not a perfect internal camera that nobody has ever been shown to possess.