IT Glossary
What is HTML?
HyperText Markup Language: the language that gives every web page its structure — headings, paragraphs, links, images and forms.
Strip away the design, the animations and the scripts, and what a browser actually receives is a text document with labels on its parts. This is a heading. This is a paragraph. This is a link, an image, a form field, a table. HTML is that labelling system, and it has been the substrate of the web since 1991 — which is why a page written then still renders today, a longevity almost nothing else in technology can claim. Styling is a separate language, behaviour is a third, and the separation is deliberate: the structure survives redesigns. Why this matters to someone buying a website rather than building one comes down to who else reads that structure. Search engines rely on the labels to understand what a page is about and which parts matter. Screen readers navigate by them, which is what makes a site usable for people with visual impairments and compliant with accessibility law. Browser reading modes, social previews and increasingly AI systems all consume the same markup. A page that fakes headings with large bold text looks identical to a human and is close to invisible to all of them.
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Why it matters for your business
The foundation of technical SEO
Correct headings, links and metadata are how a search engine understands the page, before any content strategy has an effect at all.
Accessibility built in from the start
Proper structure makes a site navigable by screen readers and keyboards, which is both a legal requirement and a wider audience.
Longevity guaranteed by standards
Markup written correctly keeps working across browser generations, so structure outlives every redesign the brand goes through.
Frequently asked questions
Do I need to know HTML to manage my own website?
No. Modern content management systems handle the markup for you, and a business owner should be editing text and images, not code. A little familiarity pays for itself in two situations: pasting content from a word processor without importing invisible formatting, and understanding why an agency insists a page needs one main heading rather than five.
What is semantic HTML and why does it appear in SEO audits?
Semantic markup uses elements that describe meaning — heading, navigation, article, list, button — instead of generic containers styled to look like them. Audits flag it because search engines and assistive technology extract structure from those elements. A page of styled boxes may look professional and still communicate almost nothing about its own hierarchy to anything that is not a pair of human eyes.
Our old website has messy HTML — how much does that matter in practice?
It matters where it touches money. Broken structure that hides content from search engines, missing form labels that block accessibility, and duplicated identifiers that break scripts are worth fixing. Untidy but functional markup that nobody reads is not worth a rebuild on its own. Get an audit that separates the two, because suppliers quoting a full rewrite rarely make that distinction for you.
Let’s talk about your project
Message us on WhatsApp or send an email — you talk directly to a developer.
office@northdan.com · +40 752 070 247