An ounce is a unit of weight commonly used in the United States and other countries that follow the imperial system. One ounce is equivalent to approximately 28.35 grams. Ounces are often used to measure food ingredients, such as flour or sugar, and are also found on product labels for items like beverages and snacks. There are two main types of ounces: the avoirdupois ounce, which is used for most everyday items, and the troy ounce, which is primarily used for precious metals like gold and silver. Understanding ounces is important for cooking, baking, and purchasing products accurately.