Originally Posted by
Keveak
Ask your English teacher or something, I've only heard them mentioned once (it's part of basic danish education to know the genres and what they generally are not why) but I know that they are part of some official rules for literature (I believe it's for stuff like "the years best Scifi book" awards so you are sure it qualifies for it, or maybe it's just how governments are) whether or not we need to use them is up to us, they only matter if we want to have it official (we could call it scifi but they might say fantasy).