CCTV ( Closed-Circuit Television )

It is a device to use live video capture device. It first used in Germany 1942 and invented by Walter Bruch . Now a days it is used in so many places like road , airports , school , business places and etc. 

                                                          Types of CCTV camera 

Dome camera - Dome Cameras are named after their shape is typically used for indoor security systems. The dome shape of these cameras allows them to be inconspicuous because it is hard to tell the direction the cameras are facing; however, being still visible to the eyes. They are widely used in retail spaces. Since they are installed on the ceiling of the room, they are mostly vandal proof. Some dome cameras are designed with infrared illuminator , which enable them to capture videos in low light conditions.  

Bullet camera - Bullet Cameras have a long and tapered cylinder-like design that resembles an oversized ammo cartridge. They are mostly used outdoors, especially in areas where long viewing is necessary. However, they can be used indoors where the long viewing is required, like backyards and parking lots. They are installed inside protective casings and are typically weatherproof. Most bullet cameras come with a fixed length that allows the angle of view of up to 80 degrees. A bullet camera is usually fitted with a fixed or varifocal lens. 

 Day/Night CCTV Camera

These types of CCTV cameras can be used in both poorly lit and standard environments. Mostly used outdoors, these surveillance units have a wide dynamic range and can function under direct sunlight, glare, or reflections. They are used 24×7, and these cameras do not require an infrared illuminator as they come with an extra sensitive imagining chip, which is used in the dark. 

 Network/IP CCTV Camera

The IP camera can transmit recordings over the internet. It may or may not require a wire connection. Yes, it also works on wireless technology. In comparison to the analog camera, it is easy to install. It is possible to send recording over a far distance without requiring any power boost using a cable.