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Consequences of using just nonatomic instead of using nonatomic, weak for IBOutlet properties in iOS

What are the consequences of using the following declaration

@property (nonatomic) IBOutlet UILabel *imageTitle;

instead of using nonatomic, weak as follows :

@property (nonatomic, weak) IBOutlet UILabel *imageTitle;

in the property declaration in Objective-C (iOS 8 and higher, Xcode 6 and higher)

Previously, we had to explicitly use the weak keyword and corresponding strong keyword for controllers and delegates but it seems in your tutorials, you do not use the strong and weak keywords in your property declarations.

What is the difference and what are the consequences of not putting in the strong and weak keywords?