What specific quantification does the correlation function provide regarding galaxy distribution?

Answer

How likely it is to find two galaxies separated by a certain distance

The correlation function measures how likely it is to find two galaxies separated by a certain distance, which directly quantifies how 'clumpy' the Universe is on different scales.

What specific quantification does the correlation function provide regarding galaxy distribution?
structureuniversecosmologylarge scale structureLSS