XML (Extensible Markup Language) is a markup language designed for encoding documents in a format that is both human-readable and machine-readable. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. XML is widely used for data interchange between different systems and applications. It provides a flexible and extensible way to represent structured data. XML documents consist of elements, attributes, and text content. Elements are enclosed in start and end tags, and attributes provide additional information about elements. XML is a text-based format, which makes it easy to parse and process. It is often used to store configuration data, exchange data between web services, and represent data in databases. XML's self-describing nature makes it a popular choice for data serialization and storage. The 'xyz' extension is not the standard extension for XML files; the standard extension is 'xml'. However, sometimes, developers or specific applications might use 'xyz' for XML files for various reasons, such as obfuscation or internal processing. In such cases, the file content would still adhere to XML syntax.