Describe what a “reset” CSS file does and how it’s useful. Are you familiar with normalize.css? Do you understand how they differ?
A CSS Reset (or “Reset CSS”) is a short, often compressed (minified) set of CSS rules that resets the styling of all HTML elements to a consistent baseline. We should use reset css because every browser has its own default 'user agent' stylesheet, that it uses to make unstyled websites appear more legible.
Normalize you might call a CSS reset alternative. Instead of wiping out all styles, it delivers a set of reasonable defaults. It doesn't unset things that are already consistent across browsers and reasonable (e.g. bold headers). In that way it does some less than a reset. It also does some more than a reset in that it handles quirks you may never consider, like HTML5 audio element inconsistencies or line-height inconsistencies when you use sub and sup elements.