XML has become an invaluable technology for developers. It's a markup language that allows for efficient data transfer and storage, and it's an essential tool for creating web applications. With XML, developers can create powerful web applications that are easy to maintain, as well as quickly transfer data between servers. XML also provides a powerful, versatile language for creating unique and complex data structures. This makes it one of the most popular and widely used technologies in web development today. XML is also incredibly flexible – it can be used to create custom data formats, allowing developers to tailor data structures to their specific needs. This makes it a great choice for creating complex web applications.