Soldering wire is a metal alloy used to join two or more electronic components together. It typically consists of a mixture of tin and lead, although lead-free options made from copper or silver are also available. The wire melts when heated with a soldering iron, allowing it to flow into the joint and create a strong electrical connection once it cools and solidifies. Soldering wire comes in various diameters and compositions, catering to different applications in electronics and electrical work. The choice of soldering wire depends on factors like the type of components being joined and the required strength of the connection.