A weld is a process used to join two or more pieces of material, typically metals or thermoplastics, by applying heat, pressure, or both. This creates a strong bond between the materials, making them act as a single piece. Welding is commonly used in construction, manufacturing, and repair work. There are various welding techniques, including MIG (Metal Inert Gas), TIG (Tungsten Inert Gas), and stick welding. Each method has its own advantages and is suited for different applications. Proper safety measures are essential during welding to protect against hazards like burns and fumes.