Why is Unity creating 2 processes?

When I open a unity project, only 1 unity process is created. However, as soon as I make some changes to the scene or a prefab, unity spawns a separate process that hangs after a few seconds. Killing the new process does not seem to affect the editor window in any way, but it will respawn if I make another change. Is this normal? If so what is the purpose of the second process? Thank you! I'm using Unity 2020.3.10f1 on Mojave 10.14