Software: Unreal Engine 4.25 Creating HDRI environment backgruond and lighting* in UE4: Note: Lighting using a panoramic HDRI background is also referred to as IBL – Image Based Lighting. * T…
Source: UE4 – HDRI Environment & Lighting – Oded Erell’s CG Log
Source 2 : https://docs.unrealengine.com/en-US/Engine/Rendering/LightingAndShadows/HDRIBackdrop/index.html