Ubuntu Dash Home

From IThelp

UbuntuDashHome.png

The Dash allows you to search for applications, files, music, and videos, and shows you items that you have used recently. You will find Dash Home on the top in the left menu on the desktop or you can open it with the super key (the key with Windows logo) on the keyboard. Close Dash Home with the Esc key.

link You can read more about Dash Home here