The Move Selected Bulk Action option gives a user the ability to move multiple resources at once, instead of one by one.
To do this go to the resource folder containing the assets you wish to move, and select the checkbox next to each resource on List View, or on hover on Mosaic View.
Then, from the Select Bulk Action menu click Move.
A pop up window will appear, where you can select the folder you wish to move the resources to. Click on the desired folder and then click Move.