Hello, I'm an expert in web technologies with a deep understanding of markup languages. Let's dive into the definitions and purposes of HTML and XML. HTML is an abbreviation for HyperText Markup Language. It is the standard markup language used to create web pages. HTML documents are made of a series of elements, which are denoted by tags (like `` for bold text), and it tells the web browser how to display the content of the page. The primary focus of HTML is to structure and present content on the web. XML stands for eXtensible Markup Language. Unlike HTML, which uses a predefined set of tags, XML allows the user to define their own tags, making it highly flexible. It is designed to store and transport data, focusing on what the data is, rather than how it looks. XML is widely used for sharing data across different systems and applications and is often used in web services and configuration files. read more >>