Taxi drivers take people from one location to another, they can either be hailed on the street or called for private hire, these are mainly known as mini cabs, and private hire taxis can't legally be hailed in the street. In places like America they also have taxis known as 'jitneys' these operate on a pre-set routes picking people up as they pass through.
Taxi's first came from Rome, where they used to have a special mechanism that would release a small ball as the carts wheel moved, they would then charge n reference to how many balls had been released. The next modern version of a taxi was brought out in 1891 which was followed by the first taxi to have a meter in it, in 1897.
Horse drawn carts for hire have been around since the 17th century where they were mainly used in London and Paris. Since this time they have become popular throughout the world, the 19th century saw Hansom cabs replace the older horse drawn taxis due to them being safer and faster.
Gasoline taxis have been popular in Paris since the 19th century, London and New York later followed in the 20th century. Taxis in New York were imported from France by a man called Harry N Allen, who was also the first person to paint his cabs yellow, this was because he found this was the easiest colour to see from a distance. Since taxis were first invented they have has a number of new features added to them, from meters to two-way radios allowing drivers to talk to the office to receive jobs on the road.
Today there are a number of forms of transport that are used as taxis, from horse drawn carts to water taxis and gondolas. A number of 'posh' cars are also popular to use as taxis, from cars like Mercedes-Benz. There are also a number of companies who offer limousine hire, this was first seen as an American trait with school children hiring them for their school proms and leaving days. However this is now just as popular in the UK with senior schools having proms and last day events many see their pupils turn up in limousines.