A connector is a coupling device which provides an electrical and mechanical connection / disconnection between two or more wires or between a cable and a set of equipment. Connectors are used in almost every electronic device. They can be very expensive or just a few pennies but no matter what they cost they are critical when it comes to making things work properly. They can designed in to almost any application using any number of factors from size to cost to environment. Here are some examples of some of the more common styles of connectors.