When we're writing a piece of organ music and examining the score, looking for synchrony, we realize, if we haven't already, that the process of creation involved with composition is a whole lot like improvisation.
Only in very slow motion (photo).
There is this difference however: with composition, we can go back, as many times as we want, and insert, remove, or change whatever we feel needs editing, if anything; it's like driving on a road where it's possible to back up.
With improvisation, we're on a one way street in a vehicle with no reverse gear; whatever we improvise, once played, stands just the way it is [See blog, Improvisation, Parts I-VI].
But knowing something about both kinds of roads is part of learning what driving is all about.