Cable cars are a form of public transportation that have been around since the late 19th century. They are powered by an overhead cable and use either a grip or a trolley pole to connect to the cable. Cable cars are also known as TRAMS or TROLLEYS, depending on the region. TRAMS are typically used in Europe and Australia, while TROLLEYS are more commonly found in North America. Cable cars are a popular form of transportation in cities such as San Francisco, where they are used to traverse the steep hills of the city.