If you edit or add ACDSee Metadata, e.g. Categories, Rating, Color Labels, Keywords, etc., to your files, ACDSee program will automatically add the new data to its database. Once you have assigned ACDSee Metadata to a file, the file is linked to the database.
However, if the file is moved using Windows Explorer, or any application other than ACDSee, the link will be broken.  Embedding ACDSee Metadata in the files is a safe way to back up this data and make it easier to retrieve if you should need to.

For more information about embedding procedure, please visit this tutorial