Aerating is a simple process. It consists of perforating the soil (1-2 inches deep into the soil) with small holes, which allows water, air, and fertilizer to get to roots. Aerating enables the roots to grow deeply, reduces the density of the soil, it decomposes thatch (it turns it into compost), this means more organic soil in you yard, creates an excellent place for seed germination, and produces a more vigorous lawn. Over-seeding with endophytic grass type that resist more drought, disease and insects plus give that natural lush green color. Note that patient is the key, it takes at least 2-3 weeks for seed germination.
