IPTC or XMP headers inside each image file or in sidecar files.
* Share: Resizing, exporting, e-mailing and printing.

Not so common, or differentiating features

* Pictures can be organized by one or more mechanisms
** Images can be organized into folders, which may correspond to file-system folders.
** Images may be organized into albums, which may be distinct from folders or file-system folders.
** Albums may be organized

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