12-gauge wire is a type of electrical wire commonly used in residential and commercial wiring. The "gauge" refers to the thickness of the wire, with lower numbers indicating thicker wire. A 12-gauge wire is thicker than 14-gauge wire, allowing it to carry more current safely. It is often used for circuits that require higher power, such as those for appliances or lighting. This wire is typically made of copper or aluminum and is insulated to prevent electrical shock. The insulation helps protect the wire from damage and reduces the risk of short circuits. 12-gauge wire is a popular choice for various applications, including outdoor lighting and power tools.