Multiple choice technology web technology Abbreviation for XML Extended Markup Language EXtensible Markup Language Extension Markup Language Extensional Markup Language Reveal answer Fill a bubble to check yourself B Correct answer Explanation XML stands for EXtensible Markup Language. The 'X' stands for 'Extensible' (not Extended, Extension, or Extensional), meaning users can define their own tags and document structures. This extensibility is XML's key feature.