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Solder is the common name for a range of metal alloys (often tin and lead) that usually have a low melting point. It is melted and used to form electrically conductive joints between wires, circuits, etc.

Solder is commonly mixed with, or used with flux, which is a reducing agent designed to help remove impurities (specifically oxidised metals) from the points of contact to improve the electrical connection.

See also: soldering iron