ChapStick is a brand name for lip balm manufactured by Wyeth Consumer Healthcare, used in the United States, Australia, Canada, and United Kingdom. It is intended to help treat and prevent chapped lips; hence the name.
Due to ChapStick's popularity, the term has become a genericized trademark, used to refer to any lip balm contained in a lipstick-style tube and applied in the same manner as lipstick. However, the term is still a registered trademark, with rights exclusively owned by Wyeth. _Wikipedia