Underlayment is a layer of material placed between the subfloor and the finished flooring, such as carpet, laminate, or hardwood. It serves several purposes, including providing cushioning, reducing noise, and offering moisture protection. This layer can enhance the comfort and durability of the flooring above. There are different types of underlayment, including foam, cork, and rubber, each suited for specific flooring types and conditions. Choosing the right underlayment can improve the overall performance of the flooring, making it essential for a successful installation and long-lasting results.