The file extension JPG stands as a Picture Extension that means:
Both JPEG (Joint Photographic Experts Group) and JPG (Joint Photographic Group) are bitmap compression formats for picture and image files with compression ratios ranging from 10:1 to 20:1. In fact, JPG and JPEF file formats are identical. Older DOS-based computers were designed to handle a maximum "3-character file extension" which is why JPG was attributed to compressed image files. Newer Operating systems such as Windows XP and Vista allow for longer file extensions as evidenced by ".html". XP and Vista will also support the older JPG file extension.
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