Maven manage your module/projects from building, dependency management, generating project website (if you want to), deals with packaging, and deployment (if you want to), and many more (via plugins).

Maven is essentially NuGet+MSBuild or Ant+Ivy or Bundler+Gem+Rake without having to manage build tasks manually.

Those tasks are: 1. Compile code 2. Compile test code 3. Run unit-test 4. Run integration-test (separately from unit-test) 5. Setup paths for running unit-test (say you want to use different config/resource files for your unit-test) 6. Package your artifacts _without_ the unit-test artifacts

Maven has these built-in and in a non-disruptive manner. Don't have unit-tests? Maven won't run anything for you.

You have unit-tests source code and assets that you don't want to be included in your final build? Maven will handle that out-of-the-box-no-config needed.

While people might prefer to use "one tool that does its jobs beautifully/correctly", the reality is that you need at least 2 things to build the project: tool to manage your dependency and tool to build+package your project.