You might want to convert your Arduino board into something powerful with exceptional abilities such as making a cellphone, GPS tracker, calculator, cellphone jammer and many other things your Arduino can't normally do, you need a shield to make this work. Shields are expansion boards which adds functionalities to an Arduino board. There are various types of Arduino shields with wide applications. Selecting an Arduino shield for your projects depends on the applications. If you want to make an obstacle avoiding robot, you will need a motor driver shield for controlling the speed of the motor. In this tutorial I've listed the examples of shields you will need to expand the functionality of your Arduino boards.
Types of Arduino shields.
Here are the types of shields you might need.
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Arduino