Overview
XML stands for eXtensible Markup Language. XML is a markup language that defines a set of rules for encoding documents in a human-readable and machine-readable format.
To learn XML, you must know HTML, Javascript, or VB script. XML uses Document Type Definition(DTD) or XML schema to describe the data. The W3C organization developed XML in 1998.
eXtensible Markup Language (XML)
XML is designed to describe data and data exchange between applications and transport over the network. XML uses tags, but the tags are not predefined; we need to define our own tags.
XML vs HTML
We should note that XML is not a replacement for HTML, but both are designed with different goals. HTML uses predefined tags where, whereas XML does not. HTML was designed to display and describe data, whereas XML focuses on what data is. HTML is about displaying information, while XML is about describing information.
XML is cross-platform and hardware-independent for transmitting data across various devices. It is considered a future web development tool for all data manipulation and transmission applications. XML is designed to store, carry, and exchange data, not display data. XML tags are case-sensitive. Programming in XML is done on the server side.