Object-oriented programming is a way of organizing the code as a collection of objects that incorporate both data structure and behavior. In the real world, it is better to place the data and related methods in a class, rather than having the data structure separate from the behaviors. If you keep it separate, it will lead to data corruption, increase the complexity, and create lot of confusion, especially if the project runs on a million lines of code.
An object is an instance of the class that models the related data structure and behaviors into a discrete unit. For example, Animal is a class that consolidates the properties of the animal, such as, name, age, weight, type, and so on, into data structures, and the behaviors, such as, eat, move, talk, and so on, defined in the class. You can instantiate the class and set the specific values for the instance. The instance with specific values stored in the data structure, and with behaviors defined...