A station on the Piccadilly Line since 15 December 1906, and Victoria Line since 1968, in Travelcard Zone 2. Mainline services began 1861, and the station has been served by many different railway companies in the past.
There is a bus station just outside the station.
The Wikipedia page is [1] - which describes the complex history of the station, and the TfL page is [2]. A video - one of several - here