JPEG. it's a version pictures are saved under. like btmp (bitmap)
A .jpg or .jpeg file is a still image transmitted in electronic form. It is usually a photograph produced in an electronic camera and saved in its card, but can also be produced from a scanned image, or without any real world reference at all such as a graphics or art program, or an oekaki drawing. The name derives from the Joint Photographic Experts Group, which developed the standard in the mid 1980s.