Perhaps a foam or felt layer called an underlay is placed between your carpet and floor. Whatever flooring you decide on for your home will rest on top of it. It’s not like an underlay, which you cannot see, is unimportant because you cannot see it. The life of your flooring is increased by the carpet underlay, which also makes barefoot walking more comfortable. Additionally, it significantly aids in maintaining the carpet and shielding it from dampness. Many sounds, including footfall and furniture movement, are muffled by the carpet underlay, which also serves as a shock absorber. Additionally serving as soundproofing material is the carpet underlay.