CSS stands for Cascading Style Sheets
Styling can be added to HTML elements in 3 ways:
Inline - using a style attribute in HTML elements
Internal - using a element in the HTML section
External - using one or more external CSS files
The most common way to add styling, is to keep the styles in separate CSS files. But, in this tutorial, we use internal styling, because it is easier to demonstrate, and easier for you to try it yourself.