This is a piece of pottery used to store various crops, sauces, pastes, kimchi, or liquor, which has a relatively narrow mouth and bottom and a wide body. The jar has a wide mouth to effectively receive sunlight when storing fermented foods including soy paste, pepper paste or kimchi, or for drying and storing crops. The jar comes in variety of shapes and sizes, depending on its purpose. There are several types of jar, including a large-mouthed jar, a long-necked jar, and a short-necked jar. Large jars are often used to store and ferment sauces, liquor, or kimchi, or to store water, salt, or crops. Mid-sized jars are for storing sauces such as soy paste, while small jars are for pepper paste, pickled vegetables, or salted seafood. A high-quality, well-fired jar has no holes and makes a clear sound when tapped. In contrast, those fired during the summer season can easily spoil the stored food, while those of heavy weight or with a rough and blackish surface are low-quality jars. Such jars can be made from various materials including clay, metal, porcelain, and glass. Jars often have a lid of the same material, although those used for storing crops often use a straw cover for better ventilation and humidity control.