What does oop stand for?

OOP (Object Oriented Programming) is the implementation phase of OOD. OOD (Object Oriented Design) is a philosophy that considers things as objects that have attributes and methods. There can be public attributes and methods, and there can be private attributes and methods. The public interface is used to design the relationship between the object and its users, while the private interface is used to design the implementation of how that object works. If done correctly, the private implementation can be changed without requiring any change to the public interface or to its users. Often, a new object can be defined as a derivation of some other object, such as an officer is an employee. The derivation would add the necessary public and private aspects of an officer while inheriting the prior implementation of the public and private aspects of an employee.