XMP (Extensible Metadata Platform) is Adobe's metadata format, stored as embedded XML/RDF. It commonly carries edit history, software version chains, and — increasingly — AI generation markers that overlap with what C2PA records. AiEraser detects XMP packets across JPEG, PNG, and WebP and removes them during cleaning.
XMP is just a text-based XML packet embedded inside the file (often inside the same JPEG APP1 segment EXIF uses, identified by a distinct "http://ns.adobe.com/xap/1.0/" signature rather than the "Exif" one). Tools that only check for the EXIF signature can walk right past an XMP packet sitting in a structurally similar-looking segment — this is one of the more common gaps in basic metadata tools.
AiEraser's View mode flags XMP packets distinctly from EXIF so you can see exactly what's present before cleaning.