What is the difference between saving user credentials in NSUserDefaults and iOS Keychain

Question

I'm curious to know the difference between saving user credentials in NSUserDefaults and iOS Keychain. How I use NSUserDefaults to store username and password and access throughout the application. I also read about keyChains, but I don't understand which one is better for security? Is UserDefaults unsafe to save user credentials ?.

Answer 1

UserDefaults is local and not secure. IOS KeyChain, can be transmitted through iCloud and requires that the user is logged in.