Silicone and saline implants are the two main types of breast implants. Silicone implants are filled with a cohesive silicone gel, while saline implants are filled with sterile saltwater solution. Silicone implants generally provide a more natural feel and appearance, while saline implants may have a firmer feel. The choice between the two depends on factors such as personal preferences, body type, and the recommendations of your plastic surgeon. It is important to discuss the pros and cons of each type with your surgeon to make an informed decision.