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I am learning Blender and I see a lot of videos where people use like "test environments" to test lighting, reflection, etc.

Something like this (seen in Blender Guru Video) enter image description here

I was wondering if they have a specific name and what is their purpose (above testing light and reflections)?

If someone knows where to download one (for free) would be great.

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I guess you're referring to HDRIs.

There are things to know about how to use them. Among all the tutorials out there, you should watch the Image-based lighting course by Gleb Alexandrov. It's the most up to date and best one.

Now here's where you can find some good ones for free :

Less high-res (usable for lighting and reflections but not for direct background viewing) :

I guess you're pretty much covered. Have fun Blending.

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