Almost all digital cameras save photo (JPEG, RAW, TIFF) files with EXIF (Exchangeable Image File) data.
Camera settings and scene information are recorded by the camera into the image file. Examples of stored information are shutter speed, date and time a photo was taken, focal length, exposure compensation, metering pattern and if a flash was used.
Camera Used: Canon 6D
EXIF Data:
ISO: 12800
Aperture: f 5.6
Shutter Speed: 1/15
Focal Length: 105mm
Photo File: JPEG, Edge blur (slightly)
Location: Northport, NY