Uber is an American venture-funded startup and transportation network company based in San Francisco, California that makes mobile application software ("app") that connects passengers with drivers of vehicles for hire and ridesharing services. The company arranges pickups in dozens of cities around the world.
Initially, Uber drivers had cars such as Lincoln Town Cars, Cadillac Escalades, BMW 7 Series, and Mercedes-Benz S550 sedans. After 2012, Uber added a wider selection of cars to market to a broader cross-section of the market, called UberX. Cars are reserved by sending a text message or by using a mobile app. Using the apps, customers can track their reserved car's location.
As of 2012, Uber had indicated it was planning to expand operations to include non-taxi ridesharing. [Source: Wikipedia]