Preservation methods are techniques used to maintain the quality and extend the shelf life of food, artifacts, or natural resources. Common methods include refrigeration, canning, drying, and pickling. These techniques help prevent spoilage and protect against bacteria, mold, and other harmful organisms. In addition to food, preservation methods are also important for cultural heritage. Techniques like climate-controlled storage and conservation treatments are used to protect historical items, such as artifacts, documents, and artworks. These methods ensure that valuable pieces of history remain intact for future generations to study and appreciate.