The Activities Overview is what the GNOME docs team calls the GNOME version of Unity's dash, what you see when you throw your mouse to the top left corner of the screen, or alternatively if you tap the Super/Windows key.
The Activities Overview is what the GNOME docs team calls the GNOME version of Unity's dash, what you see when you throw your mouse to the top left corner of the screen, or alternatively if you tap the Super/Windows key.