HTML
also HyperText Markup Language
The markup language that defines the structure and content of a web page — headings, paragraphs, buttons, images, and links.
Analogy
Like the skeleton of a house — it holds everything up but isn't styled or moving yet.
Why it matters
Every funnel page, landing page, and email you touch is HTML underneath, so reading it lets you tweak and debug what you build.
In practice
An <h1> tag makes a big headline; an <a> tag makes a clickable link.