Class vs. Interface

Question

I have a quite basic question:

When should we decide to use Interface or Class for a specific class?

For example: says we have 2 classes, Customer and Doctor

Answer 1

Interfaces are used to enforce certain Methods/Properties. In a nutshell- an interface is a set of rules.

A class can be used to inherit/override base functionality.

Have a look at

• Difference between class and interface in C#?
• C#: Interface vs. Class
• Abstract Class versus Interface
• interface (C# Reference)