MIG welding, also known as metal inert gas welding, uses a consumable wire electrode and an inert gas to create a strong bond between metals. TIG welding, or tungsten inert gas welding, utilizes a non-consumable tungsten electrode and a separate filler metal to join metals. While MIG welding is faster and more suitable for thicker materials, TIG welding offers precise control and is ideal for thinner materials or intricate welds.