abdulmottaleb Elabour thinks this is interesting: In a traditional object-oriented paradigm, the only kind of type is a class. In C#, there are several other kinds of types, one of which is an interface. An interface is like a class, except that it only describes members. From 1. Introducing C# and the .NET Framework from C# 5.0 in a Nutshell, 5th Edition by Ben Albahari, Joseph Albahari Publisher: O'Reilly Media, Inc. Released: June 2012 Note very important Share this highlight http://learning.oreilly.com/a/c-50-in/71207/ Twitter Facebook Google Plus Email Get Instant Access Now Start a Free Trial Have an account? Sign in. Minimise Unlock the rest of C# 5.0 in a Nutshell, 5th Edition and 30,000 other books and videos By clicking this box, you confirm that you have read and agree to the terms and conditions of our Membership Agreement, and you understand that when your trial period ends, you will be required to provide billing information if you wish to continue using the service. Unlock the rest of this book Start a Free 10-Day Trial loading Learn about Safari for Business Have an account? Sign in.