What is meant by realisation of interface?

The realization of an interface refers to the implementation of the methods and properties defined by that interface in a concrete class. In object-oriented programming, an interface defines a contract that classes can adhere to, specifying what functionalities must be provided without dictating how they are implemented. When a class implements an interface, it provides the actual code for the methods, thus "realizing" the interface. This promotes polymorphism and allows for greater flexibility and scalability in software design.