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Without knowing details of the question the most probable answer is as follows:
In mathematics many functions can not be evaluated analytically / explicitly and thus are expressed in the form of a series.
The higher and higher terms in the series usually have lower and lower weightages.
For practical purpose long (or at times infinite) series is terminated at some stage where after the higher terms can be neglected. This decision depends on the accuracy up to which the estimation is desired.
Series Termination or Source Termination - is adding a resistor in "SERIES" with "SOURCE" of a bus/signal. The value of this resistor is the difference between output impedance of the source and the PCB trace impedance. Most of the times this value will be between 22 and 33 ohms (however these are empirical numbers)
There are many type of termination for various signal bus in General :
Ok, when the wires are left open from one end they are better receptors to RF signal and work like Antenna. Same thing is about the Bus wires, if left open the ends may response to RF signals (specially) and can reflect back to the signal side hence cause the noise to interfere with signal ultimately distorted signal. To avoid this the wires ends at BUS are grounded with a resistor to avoid any reflection back of distortion to save the data corruption. This is why termination is used.
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