Weld types refer to the various methods used to join materials, typically metals, through the application of heat, pressure, or both. Common types include MIG welding, which uses a continuous wire feed and is known for its speed and versatility, and TIG welding, which employs a non-consumable tungsten electrode for precise control and cleaner welds. Another popular method is Stick welding, or SMAW, which uses a consumable electrode coated in flux. This type is favored for its simplicity and effectiveness in outdoor conditions. Each weld type has its specific applications, advantages, and limitations, making them suitable for different projects.