I know there are more important things going on in the world, but please let me just say this! I've lost count of the number of times I have seen posters here write 'discrete' when they mean 'discreet'.
'Discreet' means careful, quiet, intentionally unobtrusive, like 'breastfeeding discreetly'.
'Discrete' means separate, detached, individually distinct, like 'The textbook is organised into six discrete chapters'.
I figure not everybody knows this so I am just passing the information on - thanks for letting me!