What is the difference between object-oriented methodology and traditional methodology?

The main difference is that the concept of object is introduced,

C is a process-oriented programming language. If he wants to realize code reuse, he will do it through program blocks.

Object-oriented, by introducing classes and objects, a module that can realize independent functions is encapsulated in a class. We use class instances to construct programs, that is, we use the combined scheduling of module functions to complete large-scale functions, and generally realize communication between modules through interfaces.