Flexible electronics are circuits designed to bend, fold, stretch slightly, or conform to non-rigid surfaces such as paper, plastic film, fabric, or curved housings. Instead of relying on rigid fiberglass boards, they use thin substrates and conductive layers that keep working under mechanical stress.
In cyber security, this matters because flexible devices are often used in wearables, smart labels, disposable sensors, and embedded IoT hardware. Their shape makes them harder to inspect and easier to hide, which can help attackers build covert trackers, tamper-evident bypasses, or small implantable devices. Defenders also use the same properties for low-cost, distributed sensing, anti-tamper tags, and environmental monitoring. Security teams should consider durability, power limits, physical access, and supply-chain trust, since a flexible circuit can be as much a security object as a computing device.