JPEG is a common method of lossy compression for images and it is not restricted to 256 colors, as GIF is.
JPEG files feature lossy compression meaning that part of the initial graphic quality will be lost during compression - if the file is too compressed, a large amount of the details will be lost and the image will seem to display 'blocks' of color.
Since JPEG format enables users to strike a balance between quality and file size, there are numerous users who opt for converting their pictures to this format.
Almost all the graphic converters available nowadays will allow users to export their images to JPEG.
Some of these applications will offer users the possibility to perform various basic editing onto the source files, such as rotate, crop or adjust brightness and color.
Also, users can also create JPEG images by using graphic capturing applications that will export the screenshots to JPEG format.