Moisture is water present in or on a material. In electronics, even a thin film of water can change conductivity, dielectric properties, and surface resistance. That means signals may leak, traces may corrode, and components or antennas may behave differently than expected. Moisture is not just a reliability issue; it is a physical factor that can alter how electromagnetic fields couple to real-world objects.
In cyber security, moisture matters because attackers and defenders both depend on stable hardware behavior. Water ingress can weaken device isolation, distort wireless performance, and create unexpected conductive paths that affect sensors, access controls, and tamper detection. Defenders reduce these risks with sealing, conformal coatings, humidity monitoring, and environmental testing. In short, moisture is a simple material condition that can shift the physical layer underneath a digital system.