HTML stands for ‘Hypertext Markup Language’ and is the fundamental markup language of the World Wide Web. It is used to define the structure and content of web pages. Unlike a programming language, HTML does not perform any logical operations, but rather describes how text, images, videos, hyperlinks and other media elements should be arranged and displayed on a web page. HTML forms the basis of every online presence and is interpreted by all common web browsers to generate the visual presentation of a web page for the user.
Structure and Functioning
An HTML document consists of a series of so-called tags and elements. These tags are enclosed in angle brackets, for example <p> for a paragraph or <h1> for a main heading. Most HTML elements consist of a start tag and an end tag, which is indicated by a forward slash in the closing tag (e.g. <p>Inhalt</p>). Some elements, such as <img> for images or <br> Used for line breaks, these are ‘self-closing tags’ and do not require a separate closing tag.
HTML elements can contain attributes that provide additional information and modify the behaviour or appearance of the element. An example of this is the src-attribute for images (<img src="bild.jpg" alt="Beschreibung">), which specifies the path to the image file, or the href-attribute for links (<a href="https://www.beispiel.de">).
The structure of an HTML document is hierarchical and enables a semantic organisation of the content. Key components include:
<head>: It contains meta-information about the web page that is not directly visible to the user but is relevant to browsers and search engines (e.g. the page title, links to CSS files and meta tags).<body>: It comprises all the visible content of the website, such as text, images, navigation elements and forms.
Importance for web development and SEO
HTML forms the backbone of every website and works closely with other web technologies:
- CSS (Cascading Style Sheets): Defines the visual appearance and layout of HTML content, such as colours, fonts and spacing.
- JavaScript: Enables interactive elements and dynamic functionality on the website.
Semantically correct and well-structured HTML is of great importance for search engine optimisation (SEO). Search engine crawlers use the HTML structure to understand content and assess a page’s relevance to specific search queries. The sensible use of headings (<h1> to <h6>), paragraphs (<p>) and specific elements such as <nav> or <article> It improves readability for both search engines and users alike and helps ensure that content can be found in search results.
The current and most widely used version of the language is HTML5, which, since its standardisation, has offered enhanced functionality for multimedia, local storage and an improved semantic structure.
