Gastric banding is a type of bariatric surgery in which an adjustable band is placed around the upper part of the stomach to create a small pouch that limits food intake. It is one of the least invasive forms of weight-loss surgery but has fallen out of favor due to its lower success rates compared to other procedures like the sleeve gastrectomy or Roux-en-Y bypass. The band can be adjusted or removed, making it more flexible than other surgeries.