Have you worked on a project consisting of a single module or multiple modules?

In my practice, I have worked on projects with both a single module and multiple modules. In single-module projects, all logic and functionality are usually concentrated in one package or module, which simplifies the structure but can complicate scaling. In multi-module projects, modules are divided by functional areas or layers, which facilitates maintenance and development, and also allows different teams to work in parallel. For example, in a Java multi-module project, Maven or Gradle can be used to manage dependencies between modules.