I just watched another WinkSound video, this time on using auxiliary sends for effects, as opposed to just placing the effect as an “insert” on each audio track. The advantage of using sends instead of inserts is mainly efficiency. You set up a single channel strip (aux) to run the effect – say, reverb – and then you can send multiple tracks through the one reverb, saving processing power and time over having a reverb effect on 5 or 10 tracks simultaneously. They can all share the effect on the aux channel. The other advantage of send effects is that you can easily and quickly hear the dry version of all the tracks routed to the aux channel by bypassing the effect on the aux.
Most DAWs do this in a similar way.
Here is the video from WinkSound showing how to do it in Pro Tools.