Explanation needed for Trailing Step

Hello dear traders,

I wish to use a trailing stop EA with intergrated trailing Step function.
Is there somewhere maybe for once and for all a clear educational explanation of how an trailing stop and especially trailing step exactly works ?
Preferably with a schematic example...
Any help is welcome, because there is as yet so much doubt by a lot of people. Only if I can setup (understand) my EA, I can start live trading with a clear conscience.

Thanks,
Gilbert (Belgium)