PostgreSQL (usually pronounced post-gress) is a free, open source, cross-platform relational database system. It runs as a network service with which you can communicate using client programs or software libraries. At the time of writing, the project has just released version 10.0.
Although ABQ has provided a PostgreSQL server which is already installed and configured, you'll need to download and install the software on your workstation for development purposes.
Shared production resources such as databases and web services should never be used for testing or development. Always set up a separate development copy of these resources on your own workstation or a separate server machine.