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EXIF is an acronym for Exchangeable Image File Format and is specific to digital images.
This type of specification is supported by file formats such as JPEG and TIFF, and cannot be used by PNG or GIF files.
EXIF includes details related to the date when the photo was taken, the camera model and manufacturer, aperture, resolution, orientation, exposure and so on.
EXIF editors enable users to modify these details according to their preferences, or to remove them altogether.
Also, it is also possible to insert EXIF data within pictures in order to easily remember the location or the date the picture was taken.