Wire thickness refers to the diameter of a wire, which is a crucial factor in determining its electrical resistance and current-carrying capacity. Thicker wires can carry more current without overheating, making them suitable for high-power applications. Wire thickness is often measured in gauges, with a lower gauge number indicating a thicker wire. In electrical wiring, the choice of wire thickness affects safety and efficiency. For instance, using a wire that is too thin for a specific application can lead to overheating and potential fire hazards. Therefore, understanding wire thickness is essential for proper electrical installations and ensuring reliable performance in devices and systems.