Can anyone explain exactly – but still understandable – the settings for the ZigZag indicator?

Beside mathematical explanations I haven't found something useful in the net ...

Depht

- is that the range/number of candles where ZigZag searches for a new high/low? ... well, and what if there is no new high/low within that range?

Deviation

- is the deviation, ok ... so, if I have a number of 5 here, then a ZZ from point A to point B will make a point C, if that point is more than 50% the distance of A-B, right?

Backstep

???