It’s used for out of band management. With the correct hardware items (nic and gpu) it’s called vPro. With the proper certificate and supporting infrastructure it can auto-enroll into a management service such as SCCM. It allows companies to remotely view logs, bios settings and other items. With vPro it can include a complete remote KVM solution.

You can disable it from most UEFI settings interfaces without worry of causing other issues.