Name a common type of carpet fiber.

Nylon is a commonly used carpet fiber known for its excellent durability, resilience, and stain resistance. This makes it particularly popular for high-traffic areas in both residential and commercial settings. Nylon fibers can withstand heavy use while maintaining their appearance over time, which is a vital consideration for floorcovering installers. Additionally, nylon carpets can be treated to further enhance their stain resistance, making them ideal for households with children or pets.

Polyester is another fiber option but is generally less durable than nylon, particularly in terms of wear and tear. It is more prone to matting and crushing in high-traffic areas. Wool, while a natural fiber that offers a luxurious feel and excellent performance in terms of moisture absorption and warmth, can be less commonly used in everyday carpeting due to its higher cost and maintenance needs. Cotton, although it can be used in carpets, is not commonly found in conventional carpet applications because it is not as resilient or durable as nylon and tends to absorb stains and moisture, leading to quicker deterioration.

Overall, nylon stands out as a widely recognized and preferred fiber choice in the carpeting industry for its outstanding durability and versatility, making it the correct answer in this context.