What is the difference between HTML, CSS and JavaScript?

The simplest accurate framing: HTML is the structure, CSS is the appearance, JavaScript is the behaviour. Every web page is those three layers stacked on each other. The house analogy that actually holds up: - HTML is the walls, rooms and doors — what exists and how it's organised. Headings, paragraphs, images, buttons, forms. Without HTML there is no page, just nothing. - CSS is the paint, furniture and layout — colours, fonts, spacing, size, where things sit, how it reshuffles on a phone. Remove CSS and the page still works, it just looks like a 1995 document. - JavaScript is the electricity and plumbing — things that respond. A menu that opens, a form that validates before submitting, content that loads without a refresh, a counter that increments. A concrete example. You want a button that shows a message when clicked: 1. HTML creates the button: `<button id="hi">Say hi</button>`. It exists, it's clickable, it does nothing. 2. CSS makes it look like a button worth clicking: padding, background colour, rounded corners, a hover state. 3. JavaScript gives it a job: listen for a click, then display the message. What this means for learning order: learn them in that order, and don't rush past HTML. Beginners often skim HTML in a day because it 'looks easy', then spend months confused by CSS layout — usually because their HTML structure was wrong to begin with. Spend real time on semantic HTML (using the right element for the right meaning), because it's the skeleton everything else hangs off, and it's what screen readers and search engines read. A rough time split that works: a week or two on HTML, a solid month on CSS (layout with flexbox and grid is where people get stuck — that's normal, it's genuinely the hardest part of front-end basics), then JavaScript, which is the biggest of the three because it's a full programming language rather than a markup or styling language. One mental check if you're confused about which is which: ask 'is this about what's on the page, how it looks, or what it does?' Structure, style, behaviour. That question resolves nearly every 'which one do I use for this' moment.