A teapot is a vessel used for steeping tea leaves or a herbal mix in near-boiling water. Tea may be either in a tea bag or loose, in which case a tea strainer will be needed, either to hold the leaves as they steep or to catch the leaves inside the teapot when the tea is poured. Teapots usually have an opening with a lid at their top, where the tea and water are added, a handle for holding by hand and a spout through which the tea is served. Some teapots have a strainer built-in on the inner edge of spout. A small hole in the lid is necessary for air access inside to stop the spout from dripping and splashing when tea is poured. In modern times, a tea cosy may be used to enhance the steeping or to prevent the contents of the teapot from cooling too rapidly.