HDRI stands for High Dynamic Range Imaging. It is used for many purposes. I will use it in my design work. Using it greatly improves the outlook view of any design. I will use it for exterior views of my design such as the sky, or for a specific area. It can be used to enhance the look of a design by adding a night view, sunrise or sunset, or a beautiful view of a hill behind the design.
I used to use the normal Sky Look which is always fixed in the software. This would have made all my designs look the same. A friend of mine told me to use it. I download some hdri moods from (hdrihaven.com). Then I set these to my V_RAY rendering software. And I learned this setting from YouTube. Now I can use it properly. I hope this will make my designs much better.
My v-ray settings .