Explanation:

Sure! Let’s break it down:

When you create instances (objects) of a class, the class defines the structure and behavior of those instances. Here’s why:

Classes define:

• Properties (fields): Data that an instance holds.
• Methods: Functions that define what the object can do (its behavior).

Methods inside a class:

• When an instance of a class is created, any method you call on that instance behaves according to how the method is written in the class.
• For example:

Interfaces:

• In languages like Java, interfaces define a contract that a class must follow, i.e., the methods a class must have. However, interfaces don’t define how those methods work — that's the job of the class.
• For example:

In conclusion:

• Classes define the behavior of instances of the class, as they contain the actual methods that define what those instances do.
• Interfaces only define what methods the class must have, but not the implementation (behavior) of those methods.

Therefore, the behavior of instances inside a method is defined by the class.