UberX is a ride option offered by Uber that is the most popular way to travel with Uber. It is an affordable option that provides a private ride at an everyday price. UberX can accommodate up to four passengers, with one person in the front seat and three in the back. The cars used for UberX are typically sedans such as Toyota Prius, Honda Accord, and other similar models. UberX is one of the standard Uber services available within the Uber app. It is important to note that the exact Uber services vary from city to city.