As you would have discovered by now, your project's source code does not live in isolation. Often you'll find your team (and yourself!) working with an issue tracker system, continuous integration system, team mailing lists, source code revision tools, and so on.
This is the environment in which the project team resides and having this information in the POM file is critical to achieve completeness of the project POM file.
To set up environment information in a POM, make sure you have a Maven project and have "write" permission to this file. The environment information includes: