XML in simple terms: what it is used for

What is XML

XML — eXtensible Markup Language, is an extensible markup language designed for storing, structuring, and transmitting data. It was created as a universal standard for exchanging information between various programs and platforms.

The main feature of XML is that it does not define a predefined set of tags. The developer defines the document structure themselves by describing data using logically understandable elements. At the same time, XML remains human-readable and is easily processed by machines.

An XML document has a strict hierarchical structure: all data is located within a single root element, and each element must be correctly opened and closed. Thanks to these rules, XML is well-suited for working with complex and formalized data.

Why is it needed

XML is used where standardization, precise structure, and reliable data exchange are important.

XML ensures compatibility between different systems. It allows applications written in different programming languages and running on different operating systems to exchange data. It is convenient for storing complex hierarchical data. This is especially important in corporate and government information systems, where data has a strict structure and is subject to validation.

Additionally, XML supports document correctness checking using schemas and structure descriptions. This reduces the risk of errors during data transmission and simplifies their processing.

Today, XML is widely used in web services, configuration files, electronic documents, banking and telecom systems, and also forms the basis of popular office file formats.

Useful links 

XML Tutorial
https://www.w3schools.com/xml/ 
For a basic understanding of XML and working with its syntax, W3Schools remains the optimal starting point. The resource provides a clear idea of how an XML document is structured, what rules underlie the language, and what typical constructs look like. The materials are suitable for those who need to quickly grasp the principles without diving into excessive theory.

XML: Extensible Markup Language
https://developer.mozilla.org/en-US/docs/Web/XML
A more academic and refined approach is offered by MDN Web Docs. This is official documentation focused on practical web development and working with standards. Here, XML is considered not in isolation but as part of the web technology ecosystem, making the resource particularly useful for understanding real-world usage scenarios.

XML Tutorial
https://www.tutorialspoint.com/xml/
As a structured reference, you can use Tutorialspoint. The platform systematically covers key aspects of XML — from document structure to schemas and validation. This resource is convenient for systematic study and quick return to relevant topics during work.

When working with XML documents, it is important to check their correctness. For this purpose, the online XML Validator service is suitable, which allows you to quickly identify syntax errors and structural inconsistencies.

https://www.xmlvalidation.com

For analyzing and reading large XML files, it is convenient to use XML Formatter. It presents documents in a structured and readable format, which simplifies working with data and reduces the risk of errors.

https://jsonformatter.org/xml-formatter