What defines the behavior of an object in object-oriented programming and how is it implemented within the programming paradigm?

In object-oriented programming, the behavior of an object is defined by its methods, which are functions that describe what the object can do. This behavior is implemented by creating classes that define the structure and behavior of objects, and then creating instances of those classes to use in the program. The methods within the class determine how the object interacts with other objects and data in the program.