Cotton wool are pads made of cotton which are used for medical or cosmetic purposes. For medical purposes, cotton pads are used to stop or prevent bleeding from minor punctures such as injections or venipuncture. They may be secured in place with tape. Cotton pads are also used in the application and the removal of makeup. Cotton pads are soft enough that they can be used to clean babies. Cotton balls have much of the same applications as cotton pads, and can be used interchangeably.