Let’s take a look at the types of digital realities that currently exist, and how they differ from each other. Currently there are three major types of virtual experiences: virtual reality (VR), augmented reality (AR), and mixed reality (MR).
If you are looking to dip your toe into the world of Virtual Reality development, Google Cardboard is the logical place to start. The Unity integration is easy and the headsets are cheap– if not free, if you eat at McDonalds (and live in Sweden). Without a ton of work you can get a VR app running on a iOS or Android device.