When do you usually use XML?

Question

When do usually use XML? I know that when you work with AndroidStoudio, you use it, when else?

Answer 1

When creating apps, and other documents.

Answer 2

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Answer 3

it's like HTML?
「ＨＡＰＰＹ ＴＯ ＨＥＬＰ」

Answer 4

Some configuration files are in XML. Like for Apacke Tomcat.