XMP + PEF files in Download Backup

For my first few imports, the Download Backup folder showed only PEF files. Today it also imported XMP files for some of the photos imported. The photos with XMP files correspond to photos I later edited using Adobe Bridge, so I imagine the XMP files were not created on import but rather during the editing process. I did not move the files from their Download Backup location before editing them on Adobe Bridge.
Two questions:
1) Is my assumption about how and why the files were created correct?
2) Do I need to keep these XMP files or can I delete them to keep my folder cleaner?
Thank you!!

Both Bridge and Lightroom will create .xmp files. I believe that when you edit (or change metadata of) a Raw photo in Bridge, an .xmp file is created. When you edit files in Lightroom, or change metadata in Lightroom, by default no .xmp file is created, but you can turn on an option that will cause .xmp files to be created containing your Lightroom edits.
Unless you are quite an expert in the operation of your software and how the .xmp files work, I think it is best to simply leave them where they are, and make sure that if you ever move a Raw photo, you move the .xmp file with it.

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