What is CORS?
What is a delegate in iOS and why are they used ?
A delegate is a mechanism by which messages are passed from one object to another. They are widely used to pass messages between classes. In iOS delegate is used by most of its element like UITableView, UIGestureRecognizer etc.
What is the Interface in C# ?
Interfaces in C# are the definition or signature of methods, properties or events. The class which implements the interfaces must write the implementation of all the interfaces. The definition of the interface is always has public access modifier.