Mods are the top end of the vaporizer scale.. the one I got is called a pod mod since it takes a proprietary 'pod' that you fill up with the juice, and then there are box Mods like this..
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Where the tanks that hold the juice are more or less universal... these also have replaceable batteries unlike mine which is really nice.
The coils sit submerged inside the pod/tank and yeah.. you hit the button and it heats up producing the vapor. Different juices require different coils.. mine are .4ohm but are available in all sorts of different resistances.. whatever wattage you want to vape at will dictate what sort of coil you want to run as well. The best wattage for a .4ohm with my vape is apparently 30watts.. where a .8 or a full ohm coil would want 60-80 watts.
It's really nerdy shit honestly lol.
I'll have to look around for some good cbd juice that'll work in something like this.. I've used cbd disposables before but the "juice" was incredibly thick like THC oil.. kinda like an Elmer's glue consistency.