Nikon D3400 Triple Lens Parent's Kit Owner's Manual

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P, S, A, and M Modes
Mode P (Programmed Auto)
This mode is recommended 
for snapshots or whenever 
you want to leave the camera 
in charge of shutter speed and 
aperture. The camera 
automatically adjusts shutter 
speed and aperture for 
optimal exposure in most 
situations.
To take pictures in programmed auto mode, rotate the mode 
dial to P.
Mode dial