Lawn aeration is a gardening process that involves perforating the soil with holes to allow air, water, and nutrients to penetrate deep into the roots of grass. This helps to alleviate soil compaction, which can hinder the growth of healthy grass. Aeration is typically performed using a machine called an aerator, which removes small plugs of soil from the lawn. The best time to aerate your lawn is during the growing season, usually in the spring or fall, depending on your grass type. After aeration, it's beneficial to apply fertilizer or grass seed to enhance the lawn's health and promote new growth.