CCTV can function or not if we did not using DVR?

[Ir.Bob]

Hello there!.. I has one question..
CCTV can function or not if we did not using DVR?
Please help me

 

[Danger]

Unless you're using those initials for something other than what I'm used to, there is absolutely no need for a DVR. All that is required is a camera and a monitor, although some sort of storage medium is desirable in security applications.