How does XML help with websites?

XML, or eXtensible Markup Language, is fundamentally designed to facilitate the storage and transmission of structured data across different systems, making it highly effective for web development. Its primary strength lies in its ability to define custom tags that enable developers to create a clear hierarchy and meaningful representation of various types of data. This structure ensures that data can be parsed and understood consistently, regardless of the platform using it.

For instance, when data is formatted in XML, it can be easily shared between incompatible systems, retrieved by web applications, and transformed into different formats (such as HTML for display purposes) without loss of meaning. This makes XML extremely useful for web services, configurations, and situations where clear data interchange is necessary.

On the other hand, while styling HTML elements is typically handled by CSS, managing user sessions involves server-side logic that's not directly related to XML, and increasing accessibility pertains more to how content is presented rather than how data is structured. Thus, the role of XML as a structuring tool for data is what truly sets it apart in the context of web technologies.