A soldering iron is a hand-held tool used to join two or more electronic components together by melting solder. It typically consists of a metal tip that heats up when electricity flows through it, allowing the user to apply heat directly to the solder and components. Soldering irons come in various wattages, with higher wattages providing more heat for larger components. These tools are essential in electronics for creating reliable electrical connections. They are commonly used in tasks such as repairing circuit boards, assembling electronic devices, and crafting jewelry. Proper technique and safety precautions are important to avoid burns and ensure effective soldering.