The Logitech ClickSmart 820 is a digital camera that was released by Logitech around the early 2000s. It was a combination of a webcam and a digital camera with basic functionality. The camera was designed to be simple and easy to use, targeting casual users who wanted to take photos and videos without the complexity of more professional equipment.

When you refer to the Logitech ClickSmart 820 Windows driver, you're likely talking about the software required for your Windows system to recognize the camera and use its features, such as capturing photos and videos, or perhaps using it as a webcam. Since the device is quite old, it's important to note that Logitech may no longer provide official drivers for it, but older drivers can still be found and installed if you're using a legacy system.