What is xhtml explain?

Related questions

1. What are the features of css3?
2. What is the difference between HTML xhtml and html5?
3. What are the new features in css3?
4. What is the main difference between HTML and html5?
5. Why do we use html5?
6. Why xhtml is used?
7. What is the new features of html5?
8. Why should I learn html5?
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Tags

1. #extensible
2. #xhtml
3. #hypertext
4. #first
5. #family
6. #differences
7. #stricter
8. #identical
9. #almost
10. #markup
11. #internet
12. #stands
13. #version
14. #language
15. #document
16. #evolution
17. #cleaner