@Anonymous
It allows you to group things together so you can easily toggle them as a group instead of each individual object.
I believe this is what your looking for.
http://fusion360.autodesk.com/learning/learning.html?guid=c3ee221b-5eb9-454f-a023-0bee280875d3
Phil Procario Jr.
Owner, Laser & CNC Creations
Have you reviewed the 60 minutes of introductory tutorials in the learn section ?
@Anonymous ;
If you want to quickly learn about Selection Sets I highly recommend you view the following "Quick tip"
http://help.autodesk.com/view/fusion360/ENU/?caas=caas%2Fvideo%2Fyoutube%2Fwatch-v-r6aOoWRYWII.html
Hope this will explain it and help you.
IK
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