Soldering is the process of joining metal parts with melted filler metal so they form a strong electrical and mechanical connection. In electronics, it is how wires, components, connectors, and chips are attached to a circuit board. A good joint is conductive, stable, and durable; a bad joint can cause intermittent faults, shorts, or complete device failure.
In cyber security, soldering matters because hardware attacks and defenses often depend on physical access. Attackers may solder on extra wires, test clips, debug headers, or implants to read data, intercept signals, or bypass protections on a device. Defenders and hardware labs use soldering for legitimate rework, secure prototyping, and forensic analysis of modified boards. Signs of solder rework, such as disturbed pads or altered traces, can reveal tampering. Because it changes the physical structure of a device, soldering is both a normal repair technique and a common tool in hardware-focused intrusion.