A JPG is an image file encoded using the JPEG (short for Joint Photographic Experts Group) compression algorithm. The JPEG graphic format features support for up to 24-bit color, therefore it is suitable for storing digital photos.
JPG is using lossy compression, therefore the image quality will be affected when the file is heavily compressed.
JPG converters will also offer their users the option to quickly preview their images before the converting process starts.
Because the JPEG format is common for Web graphics, users will convert images downloaded from the Internet to other gaphic formats.