It doesn't guarantee you will see what happened, which is why it can be an advantage to have two dash cams, with the second facing out of the back window.
Also, most manufacturers don't recommend leaving the camera turned on when parked as it can drain the battery.
The latter is handy as it means the camera can't drain the car's battery if you accidentally leave it plugged in.
Cameras with Wi-Fi usually allow you to install an app and view recordings from your phone or tablet.
In general, Nextbase cameras are the most widely supported in the UK.
Hardwire kits can be installed to give the camera power all the time, or in cars whose 12V socket remains on when you turn off the ignition.
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Dash cams record video while you're driving so you have evidence if anything happens.
The GPS data syncs up with the video clips when played back in software bundled with the dash cam so you can watch the footage and see your location on a map.
The G-sensor detects impacts and - usually - locks the recorded video to prevent it being deleted.