Open hardware refers to physical devices whose design specifications, such as schematics, blueprints, and source files, are made publicly available. This allows anyone to study, modify, distribute, and manufacture the hardware without restrictions. Open hardware promotes transparency, collaboration, and innovation, as communities can contribute improvements and adapt devices to specific needs. In cybersecurity, open hardware can enhance trust and security by allowing independent verification of device integrity, reducing the risk of hidden vulnerabilities or backdoors. Examples include open-source microcontrollers, routers, and security tokens. However, open hardware also requires careful management to prevent the introduction of new vulnerabilities through modifications.