What is Nonatomic and strong in Objective C?

Related questions

1. What is weak and strong in IOS?
2. What is the difference between Xib and storyboard?
3. What is a Xib Swift?
4. What is the difference between null and nil?
5. What are properties in Swift?
6. What is the difference between Nsarray and Nsmutablearray?
7. What is a protocol in Swift 4?
8. What is difference between NSArray and NSMutableArray?
9. What is NSSet?
10. What is main storyboard Xcode?

Tags

1. #required
2. #strong
3. #scary
4. #pointer
5. #sound
6. #accessed
7. #retained
8. #property
9. #means
10. #threads
11. #nonatomic
12. #thread
13. #object
14. #memory
15. #multiple
16. #attribute
17. #might
18. #variable