Server Build vs Headless Build

What is difference between Server Build and Headless Mode in Build Settings window?

in my Build Settings windows I only see Server Build checkbox. However Headless Mode is option that I want.

I am trying to set up learning env on AWS. Same way as in documentation

They simply renamed the old Headless option to Server - why, I’m not sure, as it only seems to cause confusion. If you hover your cursor over the “Server” text in the build settings, you’ll see that the tooltip validates this.