What is the difference between opt in and opt out?

Related questions

1. How many numbers is OTP?
2. What does it mean when someone texts you OTP?
3. What is SMS Centre number?
4. Why am I not receiving OTP on my mobile?
5. What is OTP number in debit card?
6. How does OTP verification work?
7. What is OTP verification code?
8. How can I reset my ATM PIN?
9. What is green pin OTP?
10. What is SMS OTP?

Tags

1. #gives
2. #someone
3. #permission
4. #assume
5. #marketing
6. #while
7. #usually
8. #unless
9. #called
10. #email
11. #actually
12. #based
13. #known