How does a spacecraft change course?

What is a course correction?

When a spacecraft gets off of its trajectory, or path through space, it must be put back on the right path. The location of the spacecraft is determined and its course vector (the speed and direction of its flight) is calculated. This is compared with the path it should be on. A new vector is computed that will put it back on course. The ship's attitude thrusters aim the ship and the main thruster pushes it along the path.

Do small errors in space navigation matter?
Why does DS1 get off course?
How do we know a spacecraft's location?
How does a spacecraft get to where its going?

How does DS1 do a course correction?
When does DS1 do a course correction?
What would happen if DS1 collided with an object in space?
What is thrust?
What is attitude control?

What are vectors?