Acid-free paper is a type of paper that is manufactured to have a neutral or alkaline pH level, which helps prevent deterioration over time. Unlike regular paper, which can contain acids that cause yellowing and brittleness, acid-free paper is designed to resist these effects, making it ideal for archival purposes. This paper is commonly used for important documents, photographs, and artwork, ensuring they remain in good condition for years. Many libraries, museums, and artists prefer acid-free paper to preserve their materials, as it helps maintain the quality and integrity of the items stored or displayed.