BVG (Berliner Verkehrsbetriebe) is the company that manages all the urban transport in Berlin. Tickets are valid for all types of transportation.
www.bvg.de

Subway (U-Bahn): stations are indicated by a white “U” on blue background, the metro runs from 4am to 1 am, some lines run all night and on weekends.

Train (S-Bahn): stations are marked with a white «S» on green background.

Tramway: focused on the eastern part of the city, it is one of the oldest networks in the world.

Bus: they run from 4:30 AM to 1AM, some lines run all night.

Cycling: 3.72 miles (6000 km) of bike paths, available to two-wheeled ecological walks, are very popular with Berliners. Many retailers offer bike rental and «carts» specially designed to pick up children.