A teapot is a container used to mix tealeaves with boiling water to make tea. Usually the tea leaves are in a tea bag when the tea leaves are put into the water. The tea can be poured from the teapot into cups.
Further reading
Steve Woodhead, "The Teapot Book" A.&C. Black, 2005 ISBN0713660163.
Robin Emmerson, "British Teapots and Tea Drinking" HMSO, 1992 ISBN0-11-701509-1