Cascading Style Sheets (CSS) is a file (or a part of a html file) where you can make definitions how the design of your website should look like.
You can set up font size, height, color, position elements, boxes, and many more. the good thing is you can use one css file for your hole website. so you have one file where all the design definitions are located.
HTML, which stands for HyperText Markup Language, is the predominant markup language for web pages. HTML is the basic building-blocks of webpages. A markup language is a set of markup tags, and HTML uses markup tags to describe web pages.
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