This involves placing various kinds of implants into the body to thus increase the size. Whereas with a breast lift it raises sagging breasts and places them back into the "normal" position. Usually women that have lost weight have a bust that shrinks - these are the women that should consider an implant such as saline or silicone. Other types of women that may want to consider lifts are those that have been pregnant before because the breasts oftentimes will sag.
This is especially popular with younger mothers that have had kids and wish to fix their sagging breasts. Breast implants and breast lifts are not lifelong options, eventually you will need to have the implant removed and replaced - however, this could be a good option if you wish to augment your breasts because this usually lasts for about 10 years give or take a few years.