HTML, or Hypertext Markup Language, is a coding language used for creating and formatting web pages. It is the foundation of the internet, allowing for the creation of visually appealing and interactive websites. HTML uses a series of tags and attributes to structure and organize content, such as text, images, and links, on a webpage. It is essential for web developers and designers to have a strong understanding of HTML in order to create dynamic and user-friendly websites. With the constant evolution of technology, HTML continues to adapt and improve, making it a crucial tool for building the online world we know today.