When using stock images in your marketing campaigns, you want to stand out. That can mean ensuring you aren't using images that have already been used too often elsewhere.
Dash can help you with this.
On any asset, simply look to the sidebar for the "Check usage on the web" button:
Once you click this button, Dash will search the web for any other occurrences of this image, and present you with a usage report:
This can help you understand where else on the web the asset has been used, so you can make informed decisions as to how you might like to use it.