Breast augmentation is a surgery to enhance breast size and shape using implants (saline, silicone, or cohesive gel) or fat transfer. Implants can be placed either above or below the chest muscle, with incisions made under the breast, around the areola, or under the arm. Recovery takes a few weeks, and risks include infection, scarring, or implant rupture. Implants may need replacing over time, and body changes can affect results.