Unreal Engine is an engine that was created by Epic Games to be used for their 1998 video game "Unreal". Eventually, they released it to the public, and it is used to make many AAA games. Like unity, it is quite accessible in terms of platforms it can run on as well as being beginner-friendly. However, it is more effective than Unity when dealing with generated terrain, as well as having more use outside of the video game industry. It is often used to render 3D environments for movies or tv shows!