What is HTML and how does it work

HTML, acronimo di HyperText Markup Language, è il linguaggio standard utilizzato per creare e strutturare il contenuto delle pagine web. Non si tratta di un linguaggio di programmazione vero e proprio, ma di un linguaggio di markup: invece di definire una logica o un comportamento, descrive la struttura e il significato dei contenuti attraverso l'uso di elementi chiamati "tag". Ogni tag indica al browser come interpretare e visualizzare una determinata porzione di testo o contenuto multimediale, permettendo di distinguere un titolo da un paragrafo, un'immagine da un link, una tabella da un modulo di contatto. Questa separazione tra struttura e contenuto è uno dei principi fondamentali su cui si basa il funzionamento del web.

Born in the early 1990s thanks to the work of Tim Berners-Lee at CERN in Geneva, HTML was conceived to allow scientists to share documents through a global computer network. From that initial vision, the language has evolved enormously to become the foundation of the entire World Wide Web. An HTML document is essentially a text file with a .html extension, in which content is enclosed within tags such as <p> for paragraphs, <h1> for headings, <img> for images and <a> for hyperlinks. The browser reads this file and transforms it into the visual page that the user sees on the screen, often without being aware of the underlying structure.

The current version, HTML5, represents a significant qualitative leap: it introduced semantic elements such as <header>, <footer> and <article>, which describe content more precisely, improving both accessibility and readability for search engines. It also added native support for audio, video and interactive graphics, reducing dependence on external plugins. HTML works in synergy with CSS, which handles visual styling, and with JavaScript, which manages interactivity, forming together the triad on which modern web development is based. Understanding HTML is the essential first step for anyone who wants to approach the creation of websites and web applications.