For more such videos visit For more such videos subscribe See our other Step by Step video series below :- Learn C# Step by Step Learn Design Pattern Step by Step:- Learn Angular tutorial step by step Learn MVC Core step by step :- Learn Azure Step by Step :- Learn SharePoint Step by Step in 8 hours:- Python Tutorial for Beginners:- Learn Data Science in 1 hour :- Learn Power BI Step by Step:- Learn MSBI Step by Step in 32 hours:- Learn SQL Server Step by Step Learn Tableau step by step :- In this video we will try to understand what is the real use of C# interfaces. Below is the agenda :- Why interfaces are so confusing ? Understanding Interfaces is a contract Implicit contract in programming Explicit contracts , interfaces and impact analysis Clarifying statement :- Interface should not be changed Abstraction is a byproduct Multiple inheritance is a byproduct