VR is not new but it has come to very usefulness because of its use in applications and due to Smart phones in almost every hand it is now in its very popular stage.

What is VR?

It is acronym of Virtual Reality. For complete reference to the VR technology please do refer to this wikipedia link:

https://en.wikipedia.org/wiki/Virtual_reality

Can I experience VR?

Yes sure, why not. There are lot of apps of VR available these days in Play Store or Apple Store.

For Android phones follow this link:

https://play.google.com/store/search?q=VR&hl=en

What you need to explore VR for first time?

You will need a smartphone with VR features and a VR headphone to discover the VR by downloading the VR app of your choice.

What development platform to use as for first time?

Personally speaking I am finding a lot of potential in using Unity 3D

https://unity3d.com/learn/tutorials/s/virtual-reality

In TopologyPro we have also started looking at the things in VR using technologies from our Industry partners.  It looks great as it is very interesting to me as a technology to build applications upon and to my team as well.