18-gauge wire is a type of electrical wire that is commonly used in various applications, including electronics and home wiring. The "gauge" refers to the thickness of the wire, with a lower number indicating a thicker wire. An 18-gauge wire has a diameter of approximately 1.024 millimeters, making it suitable for carrying moderate amounts of electrical current. This wire is often used for projects like lighting fixtures, small appliances, and low-voltage systems. It is flexible and easy to work with, making it a popular choice for DIY enthusiasts and professionals alike. Proper use of 18-gauge wire ensures safety and efficiency in electrical connections.