XML documents must contain a root element. All other elements must be nested within the root element.
All elements can have sub (children) elements. Elements with sub elements are also called Nodes.
XML stands for eXtensible Markup Language
XML is a markup language like HTML
XML provides a uniform method for describing and exchanging structured data
Describes structure and semantics, not formatting
XML focuses on providing information about the data itself and how it relates to other data