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Despite the low cost, the resolution offered at present (2015) is rather impressive, with low-end webcams offering resolutions of 320×240, medium webcams offering 640×480 resolution, and high-end webcams offering 1280×720 (aka 720p) or even 1920×1080 (aka 1080p) resolution.
They have also become a source of security and privacy issues, as some built-in webcams can be remotely activated by spyware.
A webcam is a video camera that feeds or streams its image in real time to or through a computer to a computer network.Video calling support has also been added to several popular instant messaging programs. Software is available to allow PC-connected cameras to watch for movement and sound, a computer e-mailed images of the burglar during the theft of the computer, enabling the owner to give police a clear picture of the burglar's face even after the computer had been stolen.Unauthorized access of webcams can present significant privacy issues (see "Privacy" section below).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.Researchers claim that this method is accurate to ±5 bpm.
Special software can use the video stream from a webcam to assist or enhance a user's control of applications and games.