What is XHTML and where is it used?

Question

How html and xhtml differ from each other?

Answer 1

Extensible Hypertext Markup Language (XHTML) is part of the family of XML markup languages. It mirrors or extends versions of the widely used Hypertext Markup Language (HTML), the language in which Web pages are formulated.
XHTML documents are well-formed and may therefore be parsed using standard XML parsers, unlike HTML, which requires a lenient HTML-specific parser.
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Answer 2

https://www.w3schools.com/html/html_xhtml.asp