Difference between JPG and JPEG...??

People regularly ask myself...Is there any difference between JPG and JPEG...??
# In my opinion both are same but Older DOS-based computers were designed to handle a maximum "3-character file extension"...!!!
# Rest 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...!!!
# Newer Operating systems such as Windows XP and Vista allow for longer file extensions as evidenced by ".html"...!!!