Soldering is the process of joining two or more metals by melting and solidifying them to form a continuous bond. There are two types of soldering: soft soldering used in electronics, and hard soldering used in construction. The necessary tools for soldering include a soldering iron tip or gun heated to around 210°C and solder, typically a 60% tin alloy. The practice involves desoldering a circuit from a circuit board using a soldering iron tip, then resoldering it to form a triangular or diamond shape.