Network cameras aren't the ones used by NBC, ABC or FOX they are cameras that are joined with other cameras to form a network. A network really means multiple video cameras. These cameras were introduced about 10 years ago and are mainly used for security surveillance and monitoring purposes, but they can also be used for other things such as teaching, troubleshooting and internet broadcasting.
Network cameras allow you to record and monitor images over a computer IP network. You connect the cameras to the network and assign them an IP address. This allows you to watch, listen to and record images and sounds from anywhere on the network. The camera can send digitized video streams to anywhere in the world through a wired or wireless IP network.
Many models have built in computers or web servers so you don't have to connect them to a computer or use software. Network cameras enable authorized viewers from any location to access video from the same cameras at the same time. These cameras come in various shapes, styles and sizes and can range in price from about $50 to several thousand. They can be used indoors and outdoors.