In digital, a signal is broken down into 0s and 1s so every thing has a value. Either on or off. Which is similar to skidded turns or the way you might navigate a mogul field.
When I think of analog, I am thinking of the sine wave you might see on an oscillator. Looks just like the path of a perfect carve.
In other words:
The top graph is a sine wave - perfect oscillation from one turn to the other. This is how your turns should look when you can link them together by twisting the board from toe to heel side.
The bottom graph is digital - no rhythm or fluidity between turns. Just a start and stop at various points at various lengths. This is what happens when terrain is uneven or too steep or conditions are not conducive to creating a perfect sine wave.