XML is widely used for storing data.

XML, or Extensible Markup Language, is a markup language that encodes data in a text-based, human-readable format. It is used for describing and storing data in a self-descriptive, platform-independent way. This makes XML ideal for use in storage and transfer of data between different systems, due to its compatibility with other software systems. Additionally, it is commonly used for data interchange and messaging, as well as to encode data for archiving, publishing and presentation purposes. Due to its flexibility, it has become a widely used standard for data processing and sharing.