Why it showed two devices under /dev for one camera

Dear Sir,
I installed 3 USB cameras on AGX Orin Developer kit and found the dispaly as below picture:


I just want to know what that mean on AGX Orin.

Please follow the steps to launch USB cameras:
Jetson Nano FAQ
Q: I have a USB camera. How can I launch it on Jetson Nano?

The steps are eligible for all Jetson platforms.

I know how to open the usb camera.actually i did. I just confused why it showed two devices under /dev for one camera. for example, the camera on the top 1, it showed video0 and video1. it quite different with that on Jetson NANO.

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