USB ports on computer monitors are not typically used for video. Instead, they are a matter of convenience that can make adding USB devices to a computer easier.
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A USB port on a monitor is basically a USB hub built-in to the body of the monitor. Keyboards, mice, or any other USB device can be plugged into the port and be used just like it was plugged into the computer itself.
The biggest advantage to having USB ports on a monitor is one of convenience. In most cases, it's easier to plug a keyboard or other USB device into the side or back of a monitor than it is to plug it in the back of the computer, which may be obstructed or hard to access.
As of July 2010, most monitors do not have built-in USB ports included. The feature is currently only common in higher-end models.
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