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Soldering is the process of joining metal surfaces together using a filler metal to create the connection, and we call this filler metal Solder. We use soldering to create connections between a lot of things, but most commonly to create connections in electronic circuits. Nearly every electronic device you own has what’s called a printed circuit board, or PCB, in it, and each of these circuit boards has tens, hundreds, or even thousands of soldered connections depending on the complexity of the device.

A soldering iron being used to solder components onto a PCB