Mt4 optimization start, step, and stop variables explain

Hello great traders..I will be very glad if you can explain into details with typical examples what the vairables START , STEP , STOP in mt4 input variables for optimization means.Thank you.

Example, the optimizer will test the variable from 10 (start) to 15 (stop) increasing the varibale by 1 (step).

10-11-12-13-14-15

Thanks FerruFx..That was very clear.Well understood.