Why is there terminating resistor at One end of CAN cable ?

Three Controller Area Network(CAN) wires CAN HIGH, CAN LOW, and GROUND are connected from Vector VN1630 CANOe Box to my target embedded board.  Exactly where to connect the terminating resistor and what is the need for it ?
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naseeamAsked:
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Dave BaldwinFixer of ProblemsCommented:
This article http://en.wikipedia.org/wiki/CAN_bus has some good diagrams.  Terminating resistors are normally across the HIGH and LOW leads on all kinds of balanced transmission lines.  The second diagram shows a 'star configuration' which can be a little more complicated to terminate.

Terminating resistors are used to 'terminate' the line in it's 'characteristic' impedance to preserve the quality of the signal.  This minimizes unwanted reflections and signal distortions that you get with open or shorted lines.

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