Hyper Text Markup Language (HTML) is the lingua franca of the Web – a simple document syntax in which all of the web's 63 billion pages are written.
HTML is not a programming language per se', but a markup language – a way of marking up plain text documents so that Web browsers know which parts of a page are paragraphs, which parts are bold or italic, which parts are tables, etc.
Even if a web site is driven by a complicated database-backed content management system, it still must return simple HTML (and media files) to the end user's web browser for display. Thus, it's valuable to know some HTML even if your day job involves working with a content management system – knowing HTML will help you do more within the constraints of your system, and will help you fix things that are broken.
Don't be intimidated – it's simple to learn basic HTML, and you can pick it up as you go, building up your skills to eventually include more advanced formatting and styling with Cascading Style Sheets.
Filed under: Web Development