Summon a ride to your location and track it's progress using an app on your smartphone. (see below) You also get an estimate of your fare before you book the ride.
uberX fares tend to be significantly less expensive than cab fares. The cars are privately-owned and the drivers take better care of them.
You can select the level of service you wish from a nice sedan, limousine or high-end SUV.
Order food from your favorite restaurant and have it delivered to your door. See the Uber app for the Uber Eats option.