A kitchen utensil is a small hand held tool used for food preparation. Common kitchen tasks include cutting food items to size, heating food on an open fire or on a stove, baking, grinding, mixing, blending, and measuring; different utensils are made for each task. A general purpose utensil such as a chef's knife may be used for a variety of foods; other kitchen utensils are highly specialized and may be used only in connection with preparation of a particular type of food, such as an egg separator or an apple corer. Some specialized utensils are used when an operation is to be repeated many times, or when the cook has limited dexterity or mobility. The number of utensils in a household kitchen varies with time and the style of cooking.
A cooking utensil is a utensil for cooking. Utensils may be categorized by use with terms derived from the word "": kitchenware, wares for the kitchen; ovenware and bakeware, kitchen utensils that are for use inside ovens and for baking; cookware, merchandise used for cooking; and so forth.
A partially overlapping category of tools is that of eating utensils, which are tools used for eating (c.f. the more general category of tableware). Some utensils are both kitchen utensils and eating utensils. Cutlery (i.e. knives and other cutting implements) can be used for both food preparation in a kitchen and as eating utensils when dining. Other cutlery such as forks and spoons are both kitchen and eating utensils.
Other names used for various types of kitchen utensils, although not strictly denoting a utensil that is specific to the kitchen, are according to the materials they are made of, again using the "" suffix, rather than their functions: earthenware, utensils made of clay; silverware, utensils (both kitchen and dining) made of silver; glassware, utensils (both kitchen and dining) made of glass; and so forth. These latter categorizations include utensils — made of glass, silver, clay, and so forth — that are not necessarily kitchen utensils.
Benjamin Thompson noted at the start of the 18th century that kitchen utensils were commonly made of copper, with various efforts made to prevent the copper from reacting with food (particularly its acidic contents) at the temperatures used for cooking, including tinning, enamelling, and varnishing. He observed that iron had been used as a substitute, and that some utensils were made of earthenware. By the turn of the 20th century, Maria Parloa noted that kitchen utensils were made of (tinned or enamelled) iron and steel, copper, nickel, silver, tin, clay, earthenware, and aluminium. The latter, aluminium, became a popular material for kitchen utensils in the 20th century.