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The Displace node distorts the input terrain using either built-in noises, or a custom input that you can provide. Displacement is a very useful way of adding perturbances and natural looking imperfections to terrains.

If you need a bit of roughness on the terrain without altering the general shape, use Vertical displacement with lower scale and higher complexity.

Node Properties
Standard : Displacement on the horizontal (X) and vertical (Y) axes.
Vertical : Altitude displacement on the height (Z) axis.
Rugged : Strong displacement on the horizontal (X) and vertical (Y) axes.
Custom : Custom displacement on the horizontal (X) and vertical (Y) axes.
UniformWhen enabled, the Strength slider's value applies to both the horizontal (X) and vertical (Y) axes.
StrengthThe strength of the displacement. When Uniform is turned off, this controls the displacement for the horizontal (X) axis.
Strength VerticalAvailable when Uniform is turned Off This controls the displacement for the vertical (Y) axis.
ScaleThe scale of the internal noise.
ComplexityThe complexity (octaves) of the internal noise.
SeedThe randomization pattern or seed for the node's process.
IterationsNumber of times the displacement is applied repeatedly. This can help create more elaborate displacement effects.
RotateThe direction of the displacement.
High QualityWhen enabled, higher quality displacement is used to prevent directional stretching. This may take longer to process.
X / YThe position of the internal noise's origin.