An HTML editor is a software application designed to create and edit HTML code, which is the standard markup language for building web pages. These editors provide features like syntax highlighting, code completion, and error detection, making it easier for developers to write clean and efficient code. Some editors also offer a visual interface, allowing users to design web pages without needing to write code manually. There are two main types of HTML editors: WYSIWYG (What You See Is What You Get) editors and text-based editors. WYSIWYG editors allow users to see how the final webpage will look while they edit, while text-based editors focus on writing code directly. Popular examples of HTML editors include Adobe Dreamweaver, Sublime Text, and Visual Studio Code.