Let’s cut straight to the chase: It’s a plugin for either VirtualSMC or the legacy FakeSMC . Downloading it from a random kext repository (especially one not linked to the official GitHub) is a fast track to system instability—or worse, malware.

In macOS, a (Kernel Extension) is a piece of code that loads directly into the kernel of the operating system. Think of it as a driver in Windows. Kexts allow software to communicate with hardware components like graphics cards, network adapters, and—in this case—hardware sensors.