What is a common feature of digital video recorders (DVR) in CCTV systems?

Digital video recorders (DVR) in CCTV systems are primarily designed to capture and store video footage for later retrieval, making this capability a cornerstone of their functionality. This feature allows users to review footage as needed, which is essential for investigating incidents, monitoring activity over time, or verifying events that have occurred in a monitored area.

With the ability to store video, DVRs often come with various storage options, such as hard drives, enabling them to retain images and recordings over specified periods, depending on the storage capacity and recording settings. This is particularly crucial for security applications where having access to historical footage can aid in security assessments or legal situations.

While features like real-time analysis of audio inputs, integration with existing alarm systems, and continuous monitoring without recording might be present in certain advanced systems or configurations, they do not define the fundamental purpose of DVRs in CCTV systems. The primary role remains focused on the recording and storage of video, making the ability to store video for later retrieval the most defining feature of digital video recorders.