An interface can extend multiple interfaces. A class can implement multiple interfaces. However, a class can only extend a single class. Careful how you use the words extends and implements when talking about interface and class .

Can interface be extended to another interface?

An interface can extend another interface in the same way that a class can extend another class. The extends keyword is used to extend an interface, and the child interface inherits the methods of the parent interface.

Can an interface extend another interface C#?

C# allows the user to inherit one interface into another interface. When a class implements the inherited interface then it must provide the implementation of all the members that are defined within the interface inheritance chain.