A Snapshot is useful when you want to share a dashboard with a specific set of filters and a fixed time range already applied — for example, one station, one airline, and "last 7 days." Instead of asking colleagues to recreate your selections, you create a Snapshot and send them the generated link.
To create and share one: set the filters and time range you want on the dashboard, then create a Snapshot in Analytics and copy the Snapshot link. When your colleagues open the link, they'll see the dashboard with the exact configuration you saved.