Exif is the main way digital cameras store date and other information. Capturing date information is hugely valuable for most home shooters, so you'd think there'd be a robust standard around this type of metadata.
Wrong.
The Wikipedia article is excellent. Read it, understand why image editors routinely wreck Exif metadata, and weep. The article could be improved by mentioning Adobe's XMP, I'll add a comment to that effect.
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