Metadata
Whether you shoot JPEG or raw, one of the last things your camera does before it writes out a file is to embed it with metadata. Metadata is simply an extra layer of data that is laid onto the image data in the file. You can think of metadata as being like the back of a photographic print. All of the stuff that you’d normally write on the back of a print—the date and time it was shot, the names of the people in the photo—can be stored in the metadata of the file.
Your camera stores the date and time and a bunch of other information in the metadata of every image it shoots. Different cameras store different amounts of metadata, but these days almost all cameras write the date and time that the image was shot into an image’s metadata, ...
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