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The most popular use of webcams is the establishment of video links, permitting computers to act as videophones or videoconference stations.Other popular uses include security surveillance, computer vision, video broadcasting, and for recording social videos.As the bayer filter is proprietary, any webcam contains some built-in image processing, separate from compression.Various lenses are available, the most common in consumer-grade webcams being a plastic lens that can be manually moved in and out to focus the camera.Most webcams feature built-in microphones to make video calling and videoconferencing more convenient. The USB video device class (UVC) specification allows inter-connectivity of webcams to computers without the need for proprietary device drivers.Typical interfaces used by articles marketed as a "webcam" are USB, Ethernet and IEEE 802.11 (denominated as IP camera). Various proprietary as well as free and open-source software is available to handle the UVC stream.

The Wii Remote contains an image sensor with a resolution of 1024×768 pixels.

Most if not all cheap webcams come with built-it ASIC to do video compression in real-time.

Support electronics read the image from the sensor and transmit it to the host computer.

Webcams may be installed at places such as childcare centres, offices, shops and private areas to monitor security and general activity.

Webcams have been used for augmented reality experiences online.

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