Twist-on connectors, also known as wire nuts, are small plastic devices used to connect two or more electrical wires securely. They work by twisting the wires together and then screwing the connector onto the twisted ends, which helps to insulate and protect the connection from moisture and other environmental factors. These connectors come in various sizes to accommodate different wire gauges and are commonly used in residential and commercial electrical installations. Proper use of twist-on connectors ensures safe and reliable electrical connections, reducing the risk of short circuits or electrical fires.