Soldering in electronics is the process of joining components, wires, or pads by melting solder around the connection. The solder cools and forms an electrical and mechanical bond.
Where soldering is used
Soldering is used to assemble circuit boards, repair wires, attach connectors, build prototypes, and replace damaged parts. Most finished PCBs have many solder joints.
Soldering versus breadboarding
A breadboard is temporary and does not require solder. Soldering is more permanent and better for reliable finished circuits.
Good soldering is not just melting metal; it is making a clean, strong, conductive connection.