Cloud was initially a telephone network and now is a metaphor of a global network commonly used to refer to the Internet. 

Charge Coupled Device is an optical sensor semiconductor that converts light into an electrical signal from a digital camera, which corresponds to a function of photosensitive film as a general camera, and is the core of a digital camera. 

CVBS (Composite Video Banking Sync) refers to the type of television signal, which means that image signals (color difference, luminance, sink) are mixed in one signal line and audio signals are not included. Since each image-related signal is separated from the circuit inside the TV, the image quality is lower than when each signal is separated, such as RGB component input. 

Composite Video Interface is the standard of HD-Analog video developed by Dahua.