What is difference between XML & HTML according to their use in app development?

Question

I want to know about difference between XML & HTML as I am familiar with HTML and want to learn XML for Android apps development.

Answer 1

HTML - Is HyperText Markup Language, widly use this languge writing webpage. html languae as a simple palne text base language but html language made up tags,elments,

XML -
Is xtansabel mark up languge this part of html langaue it convert xhtml

we use this (XML) Language in android app developed porpossos