A few touches in your smartphone are enough to book a taxi. The taxi will come, pick and drop to your destination quickly.
The map in the app shows the shortest distance and guides you by voice. So time and cost is saved.
If you want to visit a place. By comparing the fares of the flights, you may get huge offers in bookings. Similarly you can do the same for hotels, resorts, cabs, tour packages booking.
Now you know why uber is valued at 50 billion dollar in the market.