PostgreSQL is a powerful Object-Relational Database Management System (ORDBMS). We need this because PostGIS is just an extension of it. It's open source and free of cost.
The first thing we have to do is download and install the PostgreSQL database management system. In this book, we will assume that you are working on a 64-bit Windows machine with a version of Windows 7 or later. We will use the most recent stable version available at the time of the writing, which is the Version 9.3. Perform the following steps: