Okay, so "discrete" means (according to the Merriam-Webster dictionary):
: constituting a separate entity : individually distinct <several discrete sections>
a : consisting of distinct or unconnected elements :noncontinuousb : taking on or having a finite or countably infinite number of values <discrete probabilities> <a discrete random variable>
— dis·crete·ly adverb
— dis·crete·ness noun
Whereas "discreet" means:
I hope that helps! Please be sure to review earlier editing tips We Gotta Get Out of This Habit and Department of Redundancy Department.