What is this database used for? I know that for multifields/selects for sure. But:
- do I need to import this if I want to do postcode search? Or autocomplete address? Do I need to import this database then?
- what is the difference between Database2 and Database3? Shouldn't Database2 be removed if Database3 is recommended?

Screen Shot 2015-09-09 at 08.58.55.jpg