Interfaces
An interface is a programming concept that defines a contract or set of methods that a class must implement, without specifying how those methods are implemented. It enables abstraction and polymorphism by allowing different classes to be used interchangeably if they adhere to the same interface. Interfaces are commonly used in object-oriented programming to achieve loose coupling and design by contract.
Developers should learn and use interfaces to create modular, maintainable, and testable code by decoupling implementation from abstraction. They are essential in scenarios like dependency injection, plugin architectures, and API design, where multiple implementations need to adhere to a common specification. For example, in Java or C#, interfaces allow for flexible swapping of database drivers or service providers without changing client code.