what
is
the
purpose
of
hydrolysis

Really it depends on the specific reaction you're talking about. But generally speaking the goal of hydrolysis is to break apart a larger molecule into two smaller ones by adding a water molecule.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.