These two formats are the same photo formats. There is no technical difference between a .jpg file and a .jpeg file — they both use exactly the same JPEG encoding method and save image data in the same way.
The difference is purely in the suffix, as it is a relic from the early days of computing. JPEG was created in 1992 by the Joint Photographic Experts Group. Early Windows introduced Windows in the early era, the operating system had a limitation: file extensions could only be no more than 3 characters.
This forced the four-character .jpeg extension to be reduced to .jpg for PC users. Mac and Unix systems, not having this extension limitation, could use website the longer .jpeg file extension from the start.
Although both extensions work identically in virtually all modern software, there are specific cases when a system requires the .jpeg extension. In these cases, renaming the file from .jpg to .jpeg is enough.
No actual data conversion is required — just renaming the extension solves the compatibility concern usually.
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