Why do we need DTD in XML?

Related questions

1. What is DTD explain its purpose What are the limitations of DTD?
2. What is XML DocType?
3. What is use of DTD in XML?
4. Why do we need DTD?
5. What is XML parser?
6. What is HTML XML?
7. Why is DTD important?
8. What is internal DTD in XML?
9. How many types of DTD are there in XML?
10. What is an XML parser?

Tags

1. #independent
2. #people
3. #contains
4. #control
5. #provides
6. #document
7. #agree
8. #groups
9. #purpose
10. #define
11. #interchanging
12. #common
13. #legal
14. #elements
15. #structure