What role do XML structures play in data transfer between systems?

XML structures are used for standardized data transfer between different systems and applications. They allow describing data in the form of a hierarchical tree with tags, making the information readable and understandable for both humans and machines. Due to their platform independence and extensibility, XML facilitates system integration, data exchange, and validation. For example, in interactions between a web service and a client, XML can serve as the format for transmitting requests and responses.