HTML is HyperText Markup Language. It is in the front-end (non-server side) of webpages and decides, along with CSS, what appears on the screen. I am already fluent in HTML, and yes, once you learn the language it helps you understand what goes into making a website and what constitutes a website. A tag is simply like a piece of code that acts as a flag, telling the computer what is inside the brackets and how to process it.