Terminology is often times used to encapsulate a lot of information in a single word or phrase. It’s sort of a compression of information to facilitate communication. Things like “roots of f” is a shorter way to say that: “the set of all x such that f(x) = 0”. As you get deeper into a subject the more terminology you encounter. This is why research papers are generally unintelligible to those with no training in the areas that the research is about. To not use terminology would make papers insanely long and far too tedious to read.