JPEG 
/ˈʤeɪˌpɛg/ noun
plural JPEGs also JPEG's /ˈʤeɪˌpɛg/ noun [noncount] : a type of computer file used for storing images ; also [count] : an image that is stored as this type of file
▪ Most of the pictures are JPEGs. — often used before another noun ▪ a JPEG file/image ◊JPEG is an abbreviation of “Joint Photographic Experts Group.”
▪ Most of the pictures are JPEGs. — often used before another noun ▪ a JPEG file/image ◊JPEG is an abbreviation of “Joint Photographic Experts Group.”
