It replaces the D3300 as Nikon's entry level DSLR.
In most countries the D3400 is available with an AF-P 18-55 mm kit lens that includes Nikon's image stabilization (Vibration Reduction, VR).
In the US there is an unusual two lens kit option offered only with the black body.
The D3400 was superseded as Nikon's entry-level camera by the D3500 in August 2018.
Without full AF-P lens support−P ⋅ Without AF-P and without E-type lens support−E ⋅ Without an AF motor (needs lenses with integrated motor, except D50) *