Sessions are great for independent projects over time – editorial assignments, portrait sessions, events, etc. If you like to filter and search your archives, you can import sessions into a master archive catalog so you can filter and search across your entire body of work. The caveat is that there is no syncing between sessions and catalogs. When you import a session into a catalog, it imports all the adjustments and metadata and stores it in the catalog database. Any changes you make to the session after that point in time are not recognized by the catalog, and any changes you make within the catalog are not pushed back into the session data. It is a one-time, one-way process.