An XML editor is a software application designed to create, edit, and manage XML (eXtensible Markup Language) files. These editors provide features like syntax highlighting, validation, and auto-completion, making it easier for users to write and maintain structured data. They are commonly used in web development, data interchange, and configuration files. Many XML editors come with user-friendly interfaces that cater to both beginners and experienced developers. Some popular examples include Notepad++, Oxygen XML Editor, and XMLSpy. These tools help ensure that the XML code is well-formed and adheres to defined schemas, improving data integrity and usability.