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This video demonstrates how a Threaded Linear Actuator motor runs. This is a normal step motor with a long threaded shaft. This type of stepper motor is typically used with a threaded nut that travels up and down the shaft.

This video shows how a Non Captive Linear Actuator moves. Both the shaft and the body needs to be secured for proper operation. When the shaft or motor body is not secured, it will spin freely. For this example, the shaft and motor body is secured (due to its weight and placement of wires), resulting it to move up and down the shaft.

This video explains how the Captive Linear Actuator motor operates. An internal nut spins a threaded portion of the shaft. This is one feature that contributes to make the shaft come in and out of the motor. The other feature is the two notches that you see on both sides the shaft. These two notches "captures" the shaft and does not allow the shaft to rotate. Without the notch, it will cause the shaft to rotate in place.