Why are square brackets used in quotes?

Related questions

1. Do brackets mean multiply?
2. How do you remove and simplify brackets?
3. What is the use of square brackets?
4. What do square brackets around a letter mean?
5. Do brackets go inside parentheses?
6. Does square bracket mean included?
7. Why are square brackets used in writing?
8. Does domain use brackets?
9. What are brackets called?
10. What are angled brackets?

Tags

1. #direct
2. #words
3. #sentence
4. #clarify
5. #meaning
6. #writers
7. #placed
8. #around
9. #enclose
10. #insert
11. #writer
12. #quotation
13. #integrate
14. #explanation
15. #pairs
16. #quote
17. #brackets
18. #intended
19. #square
20. #alter
21. #brief
22. #change
23. #provide
24. #always