HTML is used to structure the content of a webpage, mostly headings, paragraphs and media content. CSS controls the visual design of a website, including fonts, layout and colours. JavaScript allows the website to respond to the user’s actions. Together, they play unique and connected roles in web design. These three coding languages form the front-end of web development, which is everything the user sees and interacts with. The back end refers to the driving force of a website, supporting its functionality behind the scenes.