Solder (pronounced "sol-der", US "sod-er") is a metal alloy which is used in R/C to bond certain electrical components together. It is applied in a molten state by use of a soldering iron, a device which heats the parts being soldered to a sufficient temperature to allow the solder to melt and flow over them. A good example of the use of solder is joining wires to an electric motor's power terminals. On a smaller scale, solder is used to anchor and connect electronic components on printed circuit boards of the type found in receivers, servos and speed controls.