German cities have remarkable public transportation systems, especially when compared with American cities of equal size, and they operate with all the efficiency you'd expect from our Teutonic friends. Just about every town of substantial size has at minimum a bus system. Transport mode options increase considerably as the place you're in gets bigger. Public transportation is so good, you should never need or want a car to get around most cities. Overall, Germany probably has more urban public transportation systems, especially rail systems, than just about any other country in the world.
Nearly every town and many rural areas have scheduled local bus service.
In larger towns and cities, lines crisscross the city. Where local rail service is offered, buses compliment those services. In the biggest cities, there may be several different bus systems in operation. In Berlin, you'll even find double-decker buses. Service intervals vary widely depending on the location and time. Many large cities also offer night bus service.
In some places, especially smaller towns, bus service is operated by GermanRail (Bahnbus).
Bus stops throughout Germany are marked with this sign :