The infrared spectrum is the band of electromagnetic radiation just beyond visible red light. Humans cannot see it directly, but many silicon-based CMOS sensors can still detect some infrared wavelengths. In imaging systems, this makes infrared useful for capturing scenes or signals that ordinary cameras would miss.
In cyber security and digital forensics, infrared matters because sensor output is not always a simple photograph of visible reality. The camera may record wavelengths outside human vision, and software may then filter, remap, or reconstruct that data into a familiar-looking image. Attackers can abuse this gap to hide markers, covertly signal devices, or alter how scenes are interpreted. Defenders use the same physics to inspect hardware, verify sensor behavior, and understand whether an image reflects raw capture or heavy processing. Knowing the limits of the infrared spectrum helps prevent false assumptions about what a camera truly “saw.”