Whats the difference between jpeg and jpg?

I know they are the same Joint Photographic Experts Group but why does one have an E and one not? Which one is the latest? Any thoughts... its just one of those sad things I'd like to know?!

They are the same thing. They are both rendered the same way. Jpg was used when only 3 letters extensions could be used in DOS. When windows 95 came out, longer extensions could be used and that is when the full extension name jpeg was used.

That is the gist of it anyways.

There isn't any difference, jpg goes back to day when DOS and early versions of Windows could only recognize three letter file extensions, much like htm versus html.

JPEG is the standard compression system, jpg is simply a file extension[.jpg] used to signify that the file is encoded using the JPEG system.
JPEG itself specifies only how an image is transformed into a stream of bytes, not how those bytes are encapsulated in any particular storage medium. A further standard created by the Independent JPEG Group, called JFIF (JPEG File Interchange Format), specifies how to produce a file suitable for computer storage and transmission (such as over the Internet) from a JPEG stream. In common usage, when one speaks of a "JPEG file" the actual file is generally found to be JFIF, or sometimes an Exif JPEG file. There are, however, other JPEG-based file formats, such as JNG. Additionally, the TIFF format can carry JPEG data.

No difference. ".jpg" is the "safe" file extension, for DOS and devices that still use a FAT16 file system, where the filename must follow the 8.3 standard.

Ex. FILENAME.JPG

"JPEG" more closely matches the actual file type (a JPEG image), but ".jpg" is correct for compatibility reasons.

JPG is for systems that allowed only 3 letter extensions, jpeg is the newer extension for four letters.

.jpg and .jpeg, though .jpe, .jfif and .jif are all the same file format, just different extensions.

One and the same thing.