Aeration (also called aerification) is the process by which air is circulated through, mixed with or dissolved in a liquid
or substance.

Aeration of soil
Refers to the extent of air gaps in soil. Aeration commonly refers to the process of using mechanized equipment to
either puncture the soil with spikes (spike aeration) or remove approximately 1"X2" cores of soil from the ground (core
aeration). Spike aeration involves the use of an aeration machine with spikes up to a foot or more in length. Spike
aeration is sometimes used to address drainage issues in areas with turf. Core aeration is done on turf areas as a
means of reducing turf compaction, reducing thatch buildup, improving the infiltration of water/nutrients, and creating
an environment where grass seed can have direct contact with the soil.

Source: Wikipedia
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