Below you can see the differences between frequencies used to generate Perlin Noise Heightmaps. The higher the frequency, the more distant the noise appears, a bit like looking at a map from a distance. If we reduce the frequency, it will look like we took one slice from the whole and enlarged it without losing any data.
freq = 0.1 heightmap
freq = 0.003 heightmap
freq = 0.0003 heightmap
If you are wondering what the differences are between different types of noise, you can see them in the pictures below. They were all generated using the same seed and the same parameters.
TYPE_CELLULAR
TYPE_VALUE
TYPE_VALUE_CUBIC
TYPE_PERLIN
TYPE_SIMPLEX
TYPE_SIMPLEX_SMOOTH
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