It is also known as Mathematics for computer science. Sometimes finite mathematics, or concrete mathematics.
Discrete mathematics is the study of numerable sets, it is distinct from others. – such as integers, graphs, and statements in logic.
<aside> 🏫 Discrete $\neq$ Discreet
</aside>
https://www.merriam-webster.com/dictionary/numerable
https://www.dictionary.com/browse/numerable?s=t
https://wikidiff.com/countable/numerable#:~:text=As adjectives the difference between,able to be counted%3B countable.
Discrete. "separate, distinct from others," late 14c., from Old French discret, discre, and directly from Latin discretus "separated;" see discreet. Related: Discretely; discreteness. https://www.etymonline.com/word/discrete