XSL (Extensible Stylesheet Language) is a family of languages used for transforming and formatting XML (Extensible Markup Language) documents. It\'s primarily used to convert XML data into other formats, such as HTML, plain text, or even other XML structures. XSL consists of three parts: XSLT (XSL Transformations), XPath (XML Path Language), and XSL-FO (XSL Formatting Objects). XSLT is the most commonly used part, defining rules for transforming XML documents. XPath is used to navigate and select nodes within the XML document. XSL-FO is used for formatting XML data for output, particularly for print media. XSL stylesheets are themselves written in XML, allowing for a consistent and structured approach to data transformation. The transformation process involves applying the rules defined in the XSL stylesheet to the input XML document, resulting in a new output document. XSL is widely used in web development, data integration, and document processing to present XML data in a user-friendly and accessible manner. It provides a powerful and flexible way to separate data from presentation, making it easier to maintain and update web applications and other XML-based systems.