There is between a .jpg and a .jpeg file; they are the same format. The three-letter ".jpg" extension became standard because older Windows and MS-DOS systems were limited to three-character file extensions. Safe Handling of Image Files
: It uses the Discrete Cosine Transform (DCT) algorithm to discard "invisible" data, such as subtle color variations that our eyes don't easily notice.
While usually safe, image files can sometimes be used in cybersecurity threats.