Webcams (Web Cameras) are small cameras, often video cameras, that can be viewed and accessed through the World Wide Web, instant messaging, or through a PC video conferencing application. "Webcam" is just an nickname given to the low-resolution digital video cameras created specifically for these purposes. Webcams can also be used to record in non-real-time. Webcams consist of a lens, an image sensor, and support electronics. Although several different lenses are available, the most common lenses are a plastic lens that can set the camera's focus by being screwed in and out. If you do not want to adjust your lines then fixed focus lenses are also available. Image sensors can be CMOS forlow cost cameras or CCD. Consumer webcams usually offer a resolution of 15 frames per second. Higher resolutions, as well as higher frame rates of up to 30 fps, are also available from better brands.