The term 'bottle topper' refers to a device used to seal bottles. The two most common types of bottle toppers are caps and corks. Caps are typically made of metal or plastic and are used to seal bottles with carbonated beverages. Corks are usually made of wood or CORK and are used to seal bottles with wine or other alcoholic beverages. Both caps and corks are designed to be easily removed and replaced, allowing for the contents of the bottle to be accessed.