What is the meaning of SQL injection?

Related questions

1. What is stored XSS attack?
2. What is XSS filtering?
3. What is meant by XSS?
4. What is reflected XSS?
5. What is XSS payload?
6. Why XSS is called cross site scripting?
7. Is SQL injection a server side vulnerability?
8. What is a reflected XSS attack?
9. Why is SQL injection dangerous?
10. Is XSS client or server side?

Tags

1. #action
2. #structured
3. #language
4. #resources
5. #performed
6. #exploit
7. #request
8. #injection
9. #database
10. #changes
11. #query
12. #access
13. #input
14. #attacker
15. #security
16. #which