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What is XML?
Definition
XML (eXtensible Markup Language) is a markup language for encoding documents in a format that is both human-readable and machine-readable. It uses nested tags with attributes and supports schemas (XSD) for validation.
Why It Matters
XML remains widely used in enterprise systems (SOAP APIs), RSS feeds, SVG graphics, Android layouts, and legacy integrations. While JSON has replaced XML in most new APIs, understanding XML is still necessary for working with existing systems.