The size of a CCTV system may depend on how and where it is used,
 but the basic elements of the system are the same, regardless of its 
application. A CCTV system has at least one camera, but may include 
several cameras if needed. It also includes display monitors that pick 
up the images captured by the cameras. The display monitors have a 
direct connection to the CCTV network, which is the reason they can pick
 up the images on the cameras. Display monitors that are not directly 
connected to the closed-circuit network cannot access the signal or see 
the images provided by the cameras. 
Closed Circuit Television (CCTV) is a network of cameras and monitors
 that are directly connected on a closed circuit. This means the images 
picked up by the cameras aren’t accessible by anyone who has a receiver,
 which is the norm with regular television. Instead, the monitor must 
have a direct connection to the cameras of the system in order to access
 its signal. CCTV can be used in a number of different ways, including 
as a part of a security system for a business or residence. It may also 
be used in such applications as aerial photography, which involves 
taking photographs from up high; in football stadiums; in hospitals; and
 even in monitoring the movement of traffic at intersections. 
The size of a CCTV system may depend on how and where it is used,
 but the basic elements of the system are the same, regardless of its 
application. A CCTV system has at least one camera, but may include 
several cameras if needed. It also includes display monitors that pick 
up the images captured by the cameras. The display monitors have a 
direct connection to the CCTV network, which is the reason they can pick
 up the images on the cameras. Display monitors that are not directly 
connected to the closed-circuit network cannot access the signal or see 
the images provided by the cameras. 
