HI Israel,
It's the Temporal Reprojection checkbox.
Old:
Vs new:
Oh, and I think that if you want to Denoise an EEVEE Render, you'll have to use a Filter > Denoise Node in the Compositor. Although, I am not sure if that would even do anything, because that Node is meant for Ray Tracing Render Engines.
Many thanks!!
Taking advantage, do you have any idea why the grain appears in my viewport and render that I don't see in the teacher's video?
I don't know,
Could that be because of a 3rd party Addon? (Save your file, then goto File > Defaults > Load Factory Settings and Open your .blend.)
Do you have any Compositing Nodes already?
Maybe Kent had a super duper computer and cleaned up the image super fast with all its processing power.