The Parallels Audio Controller (x64) driver is a software component used in virtualized environments, specifically within Parallels Desktop for Windows. Parallels Desktop is a popular virtualization software that allows you to run multiple operating systems (like Windows, Linux, etc.) on a Mac. The Parallels Audio Controller is responsible for enabling audio functionality in virtual machines (VMs) running on Parallels Desktop.

When you run a Windows VM on Parallels Desktop, the Audio Controller ensures that the virtual machine can play sounds, use microphones, and output audio to your speakers or headphones. This driver acts as a bridge between the virtual machine's operating system and the host system's audio hardware.