C# Interface | Interfaces In C# | C# Interfaces Explained | C# Tutorial For Beginners

This document discusses C# interfaces, including what they are, why they are needed, and how to implement them. Interfaces define a contract that implementing classes must follow, allowing for loosely-coupled applications. Specifically, interfaces contain abstract method signatures that implementing classes fill in, enabling polymorphism and independent development. The document then demonstrates how to define and implement a basic interface to add two numbers.