As you know that, monolithic application sitting in the same server with all modules. So we don’t need to make any network call. So it is very easy and fast to communicate between modules of our E -Commerce Monolithic Application.

The communication will be INTER-PROCESS COMMUNICATION.

Inter-process communication is the mechanism provided by the operating system that allows processes to communicate with each other. So that means communication performs by method calls into the code.

This communication could involve a process letting another process know that some event has occurred or transferring of data from one process to another. As you can see that we only use method calls for communication in monolithic architectures.