Mustard is a condiment that is commonly used as a sauce or relish. It can be made from ground mustard seeds, which are mixed with water and sometimes other ingredients such as vinegar, salt, sugar, or spices to create different flavors. Mustard is typically served as a spread on sandwiches, burgers, hot dogs, and other foods, or used in marinades, sauces, and dressings. It can also be used as a pickling agent or added to soups and stews for extra flavor. The word "mustard" can also refer to the bright yellow color associated with the condiment, or any item that is similar in appearance or character.