What is described in the class methods definitions?

In the context of class methods definitions, the focus is primarily on the functionality that these methods provide. Class methods are defined within a class to perform specific actions or operations related to the objects created from that class. They encapsulate behaviors that the class can exhibit, such as processing data, modifying attributes, or performing calculations.

Functionality in this context refers to the actions that can be executed by the class methods, including anything from simple tasks to complex operations. This is fundamental in object-oriented programming, as it allows for a clear structure and organization within the code, enabling reuse and modularity.

While other terms like data, attributes, and business rules relate to the overall class structure, they serve different purposes. Data refers to the information held by the objects, attributes represent the characteristics or properties of those objects, and business rules dictate the logic and constraints within which the functionality operates. However, it is the functionality provided by class methods that defines the core behavior and capabilities of a class.