Trainers mostly contains "on" and "off" features. Editors let you the choice to edit things on your own. An example: A trainer has the feature "unlimited gold", while on it set and freezes your amount of gold to 999.999.999 instead of an editor where you can set the amount to 1-999.999.999
A savegame editor edits your savegame file instead of an editor which edits values on the fly (while the game is running).
I see that besides have trainers, many games have savegame editors. I'm just wondering what this does exactly?
Thats a really smart Question from theguardian 1130 and thank you for the really great answers,sometimes i feel a bit Thick because at my age i really don't know a great deal about editors etc.