Nikon D750 User Manual page 150

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Predictive Focus Tracking
In AF-C mode or when continuous-servo autofocus is selected in AF-A
mode, the camera will initiate predictive focus tracking if the subject
moves toward or away from the camera while the shutter-release
button is pressed halfway. This allows the camera to track focus while
attempting to predict where the subject will be when the shutter is
released.
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See Also
For information on using focus priority in continuous-servo AF, see
Custom Setting a1 (AF-C priority selection, 0 326). For information
on using release priority in single-servo AF, see Custom Setting a2
(AF-S priority selection, 0 327). See Custom Setting f5 (Customize
command dials) > Change main/sub (0 363) for information on
using the sub-command dial to choose the focus mode. See page 57
for information on the autofocus options available in live view or
during movie recording.
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