XML

XML stands for EXtensible Markup Language.

This language was designed to store and transport data. As well it is self-descriptive.

With XML, data can be available to all kinds of “reading machines” like people, computers, voice machines, news feeds, etc.

For example, XML language is being used in Magento templates giving the ability to add and remove view elements and their data such as Blocks, to different routes without rewriting action controller classes.