In cybersecurity, a dendrite refers to a thin, tree-like crystal structure that can form inside batteries, particularly lithium-ion cells. These dendrites develop as a result of repeated charging cycles, where metal ions deposit unevenly on the battery's electrodes. Over time, dendrites can grow long enough to pierce the separator between the anode and cathode, creating a direct electrical path. This can lead to short circuits, overheating, or even fires and explosions. The formation and growth of dendrites pose significant safety risks for electronic devices and are a focus of ongoing research to improve battery reliability and security.