Yes, because you put down two points for example and say you want a black line in between that is 2 points thick, it doesn't matter how far apart those two points get (or how close for that matter), it will draw that line perfectly. That's why vectors work so well for things like logos. The math part kicks in and figures it out (fortunately you don't need to understand the math part yourself!).You just need to figure out how to manipulate the points and paths by drawing lines or shapes. But if you want continuous tone like a photo, then you use pixels. Here is an article about getting started with Illustrator if interested How to get started with drawing in Illustrator
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