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The Gizmo editor contains six tools.
The Move tool allows an easier alternative to moving an objects X,Y,Z rather than through it's properties.
The Rotate tool lets you rotate an object rather than using the rotation X,Y,Z in the properties. .
The Scale tool lets you scale an object's scale X,Y,Z.
The Vertex tool allows you to edit a Mesh's polygon.
The Copy tool allows you to duplicate a objects an alternate to the copy option below the properties area.
The Smart Copy tool allows you to not only just copy but copy a certain amount of objects you want by clicking on one of the arrows and the Shift key, a menu should appear and you can enter the amount of copies you want.