Spot welding is a process used to join two or more pieces of metal together by applying heat and pressure. This is achieved by using a pair of copper electrodes that deliver an electric current to the metal surfaces. The heat generated from the current melts the metal at the contact points, creating a strong bond once it cools. This technique is commonly used in the manufacturing of automobiles and other metal products due to its speed and efficiency. Spot welding is particularly effective for joining thin sheets of metal, making it a popular choice in industries that require precise and durable connections.