Hi Walter White2,
Greetings!
Thank you for posting in Microsoft Community.
I understand that you'd like to know more about the IR camera for your Surface.
The IR camera is the hardware sensor to be able to use the Windows Hello face recognition feature. After registering your face log-in, the Windows Hello Face feature will utilize the IR camera to strictly identify your face using infrared light. Your image will be processed to be able to log in. The red light beside your front-camera is the infrared light which will light up.
See Windows Hello face authentication | Microsoft Docs for more information.