The Node.js module system is designed to simplify the organization of code and make it easier to share and reuse code. It allows developers to break their applications into separate files and modules, each of which can be managed independently.
For example, a web server application might have a module for handling requests, a module for processing data, and a module for responding to requests. Each of these modules can be written and managed separately, and can be combined into a single application. This makes it easier to maintain and update the code, and to share it with other developers.