Problem on interfacing a microcontroller

We will be using a bipolar stepper motor to control the motion of the cart.

1. How do you interface a microcontroller to a motor? Can you just connect the pins?

2. What are H-bridges? Why are they used?

3. Find a circuit configuration to connect a stepper motor to the experimenters board.
 
Deliverable: Answer the questions above and a circuit diagram as requested.

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