Why XSS is called cross site scripting?

Related questions

1. What is SQL injection and cross site scripting?
2. What is blind XSS?
3. Does same origin prevent XSS?
4. What is the meaning of SQL injection?
5. Is SQL injection illegal?
6. How dangerous is XSS?
7. What is stored XSS attack?
8. What is XSS testing?
9. What is a reflected XSS attack?
10. What is XSS filter?

Tags

1. #behind
2. #loading
3. #forcing
4. #browser
5. #inject
6. #affects
7. #allows
8. #displayed
9. #execute
10. #vulnerability
11. #victim
12. #attacker
13. #widespread
14. #while
15. #scripting
16. #applications
17. #content
18. #short
19. #modify
20. #website
21. #provided
22. #danger
23. #cross