Nikon D3400 Kit Owner's Manual

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More on Photography
2
Choose a focus mode.
Highlight a focus mode and press 
J.
Viewfinder photography
Live view
A
Predictive Focus Tracking
In AF-C mode or when continuous-servo autofocus is selected in AF-A 
mode during viewfinder photography, the camera will initiate 
predictive focus tracking if the subject moves toward 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.
D
Continuous-Servo Autofocus
In AF-C mode or when continuous-servo autofocus is selected in AF-A 
mode, the camera gives higher priority to focus response (has a wider 
focus range) than in AF-S mode, and the shutter may be released before 
the in-focus indicator is displayed.