What signs or sources do you rely on when creating objects in programming?

When creating objects in programming, the following features or sources are usually considered:

• Functional requirements: an object is created if it is necessary to represent an entity with a certain state and behavior.
• Modeling the domain: objects reflect real or abstract entities from the problem.
• Object-Oriented Programming principles: encapsulation of data and methods, inheritance, polymorphism.
• Design patterns: for example, factory methods or singleton can determine when and how to create objects.

For example, if an application has users, then an object of the User class is created for each user with fields and methods describing their properties and actions.