The four hydrazine Thruster Clusters (4 thrusters on each) can be seen at the lower part of the illustration below, which shows the entire Cassini Propulsion Module Subsystem. The hydrazine tank that feeds them is visible mid-right.
The thrusters are often used in managing the spacecraft's attitude (orientation) and, infrequently, for providing small velocity changes to the spacecraft.
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Propulsion Systems in the Basics of Space Flight