Use this widget when you want to write some notes, messages, or to give some context to the dashboard. It's basically a post-it note that you can add to your dashboard.
For example, give a brief context on the KPIs tracked in this dashboard, or an agenda for your board.
Just add this widget, type the notes (with rich text or bullets), give hyperlinks, etc. You can add this widget anywhere in the dashboard, and can drag to resize it the way you want.