What is the "original EXIF file" of the photo?

Exif is the abbreviation of English exchangeable image file. Exif file can actually be regarded as JPEG image file format, which conforms to JPEG file format standard. Exif information is a series of interrelated shooting information collected by digital cameras during shooting, and then put into the original data of well-known JPEG format files. That is to say, Exif information is a set of shooting parameters embedded in JPEG image file format, and these parameters mainly include information related to shooting conditions at that time, camera brand model, color coding, sound files recorded during shooting and even global positioning system (GPS). Simply put, it is like the date printing function on the back of a traditional camera, except that the information parameters recorded by Exif are more detailed and comprehensive. So in theory, as long as the image processing software supports JPEG file format, it can be used to view or modify Exif file information. However, if the picture is modified, the original Exif information may be lost.