A diode is an electronic component that allows electric current to flow in only one direction, acting much like a one-way valve for electricity. This property makes diodes essential for protecting sensitive electronics from damage caused by reverse currents and for converting alternating current (AC) to direct current (DC) in power supplies. In cybersecurity and network hardware, diodes can also refer to data diodes, which are devices that enforce one-way data transfer to prevent data leaks or unauthorized access between networks.