Wire nuts are small, conical connectors used to join two or more electrical wires together. They are typically made of plastic and have a metal coil inside that grips the wires when twisted on. This creates a secure electrical connection, ensuring that the wires do not come apart or short circuit. These connectors are commonly used in residential and commercial electrical work, making them essential for safe wiring practices. Wire nuts come in various sizes to accommodate different wire gauges, and they are often color-coded to indicate the appropriate wire sizes they can connect.