A MIG welder is a type of welding machine that uses a process called Metal Inert Gas (MIG) welding. This method involves feeding a continuous wire electrode through a welding gun, which melts the wire and fuses it to the metal pieces being joined. The process is known for its speed and ease of use, making it popular for both beginners and experienced welders. MIG welding is commonly used in various industries, including automotive, construction, and manufacturing. It works well on thin to medium-thick materials and can be used with different types of metals, such as steel, aluminum, and stainless steel. The versatility and efficiency of a MIG welder make it a valuable tool in metalworking.