Uber hails a ride from a fleet of Uber drivers around your location. You can get your own private ride, or share a ride for a lower fare.
Because you need to set up an account and add your credit card details before using Uber, it's one of those apps and services that's better to download now rather than when you need it.
From the app, you set your pickup location, destination, and get an estimate of your fare. Payment for the ride is automatically made when you've arrived at your destination with the credit card details you used while signing up for the Uber service.
Price: Free app download, fares are on a per-ride basis.