@Albee pretty much answered your original question...
There are two types of wi-fi connections we're talking about.
The DR750S has a built-in wi-fi connection that you would connect your phone to (You would search for a 'BlackVue' titled wi-fi on your mobile device).
This allows you to view your cameras feed, check recordings, do firmware updates, modify settings of your dashcam.
Then you have the option of connecting your dashcam TO a wi-fi hotspot (either from your mobile phone or a dedicated hotspot from your cellular provider), the difference here is the cam is connecting to the hotspot for internet usage.
Once connected, you can go into the Cloud functionality of the dashcam - allowing remote access when you're not actually local to your dashcam.
You can remotely view your dashcam feed, upload footage to BlackVue's cloud, etc.
If you have your dashcam permanently connected to a wi-fi hotspot, you can have your dashcam push out notifications for things like impact detection.
The dashcam has to be either hardwired or hooked up to an external portable battery to really make use of parking mode/cloud functions.
Hope that clears your question up a bit more.