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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.Fixed-focus lenses, which have no provision for adjustment, are also available.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.The Webcam Social Shopper is one example of software that utilizes the webcam in this manner.Webcam can be added to instant messaging, text chat services such as AOL Instant Messenger, and Vo IP services such as Skype, one-to-one live video communication over the Internet has now reached millions of mainstream PC users worldwide.Despite the low cost, the resolution offered as of 2019 is impressive, with now the low-end webcams offering resolutions of 720p, mid-range webcams offering 1080p resolution, and high-end webcams offering 4K resolution at 60 fps.Webcams have become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware.
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.A webcam is a video camera that feeds or streams its image in real time to or through a computer to a computer network.The term "webcam" (a clipped compound) may also be used in its original sense of a video camera connected to the Web continuously for an indefinite time, rather than for a particular session, generally supplying a view for anyone who visits its web page over the Internet.Webcams are known for their low manufacturing cost and their high flexibility, making them the lowest-cost form of videotelephony.
As webcams evolved simultaneously with display technologies, USB interface speeds and broadband internet speeds, the resolution went up from gradually 320×240, to 640×480, and some even offering 1280×720 (aka 720p) or 1920×1080 (aka 1080p) resolution.
Digital video streams are represented by huge amounts of data, burdening its transmission (from the image sensor, where the data is continuously created) and storage alike.