In electronics, connectors are one of those things we tend to take for granted. They're just something hanging off the end of a cable so we can plug and unplug power or signals on some circuit. But using the cheapest connector you can find may not, in the end, be cost effective if it fails to do its job.
Higher currents require larger, thicker pins.
Higher voltages require more insulation. If you've been around electronic equipment for any length of time, then you know there are many types of connectors. These have been around for decades, and are used in applications such as supplying power to a DC motor. Audio Connectors Like the Jones connectors, most of these have been around for decades. They are two-conductor connectors typically used with shielded cable.