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To address this concern, many webcams come with a physical lens cover.The most popular use of webcams is the establishment of video links, permitting computers to act as videophones or videoconference stations.Some of them, for example, those used as online traffic cameras, are expensive, rugged professional video cameras.Image sensors can be CMOS or CCD, the former being dominant for low-cost cameras, but CCD cameras do not necessarily outperform CMOS-based cameras in the low-price range.Webcam features and performance can vary by program, computer operating system, and also by the computer's processor capabilities.

The video streams provided by webcams can be used for a number of purposes, each using appropriate software: Most modern webcams are capable of capturing arterial pulse rate by the use of a simple algorithmic trick.Most consumer webcams are capable of providing VGA-resolution video at a frame rate of 30 frames per second.Many newer devices can produce video in multi-megapixel resolutions, and a few can run at high frame rates such as the Play Station Eye, which can produce 320×240 video at 120 frames per second.Typically, each frame is transmitted uncompressed in RGB or YUV or compressed as JPEG.Some cameras, such as mobile-phone cameras, use a CMOS sensor with supporting electronics "on die", i.e.

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