Baker's yeast in the context of "Scones"

Unleavened bread is any of a wide variety of breads which are prepared without using raising agents such as yeast or sodium bicarbonate. The preparation of bread-like non-leavened cooked grain foods appeared in prehistoric times.

Unleavened breads are generally flat breads. Unleavened breads, such as the tortilla and roti, are staple foods in Central America and South Asia, respectively. Unleavened sacramental bread plays a major part in Christian liturgy and Eucharistic theology.

Bread is a baked food product made from water, flour, and often yeast. It is a staple food across the world, particularly in Europe and the Middle East. Throughout recorded history and around the world, it has been an important part of many cultures' diets. It is one of the oldest human-made foods, having been of significance since the dawn of agriculture, and plays an essential role in both religious rituals and secular culture.

Bread may be leavened by naturally occurring microbes (e.g. sourdough), chemicals (e.g. baking soda), industrially produced yeast, or high-pressure aeration, which creates the gas bubbles that fluff up bread. Bread may also be unleavened. In many countries, mass-produced bread often contains additives to improve flavor, texture, color, shelf life, nutrition, and ease of production.

Dough is a malleable, sometimes elastic paste made from flour (which itself is made from grains or from leguminous or chestnut crops). Dough is typically made by mixing flour with a small amount of water or other liquid and sometimes includes yeast or other leavening agents, as well as ingredients such as fats or flavourings.

Making and shaping dough begins the preparation of a wide variety of foodstuffs, particularly breads and bread-based items, but also including biscuits, cakes, cookies, dumplings, flatbreads, noodles, pasta, pastry, pizza, piecrusts, scones and similar items. Dough can be made from a wide variety of flour, commonly wheat and rye but also maize, rice, legumes, almonds, and other cereals or crops.

Industrial fermentation is the intentional use of fermentation in manufacturing processes. In addition to the mass production of fermented foods and drinks, industrial fermentation has widespread applications in chemical industry. Commodity chemicals, such as acetic acid, citric acid, and ethanol are made by fermentation. Moreover, nearly all commercially produced industrial enzymes, such as lipase, invertase and rennet, are made by fermentation with genetically modified microbes. In some cases, production of biomass itself is the objective, as is the case for single-cell proteins, baker's yeast, and starter cultures for lactic acid bacteria used in cheesemaking.

In general, fermentations can be divided into four types:

A scone (/skɒn/ SKON or /skoʊn/ SKOHN) is a traditional British and Irish baked good, popular in the United Kingdom, Ireland, Canada, Australia and New Zealand. In the US, Scones are a different baked product from the rest of the world, usually sweeter, triangular in shape and served on their own. Scones are usually made of either wheat flour or oatmeal, with baking powder as a leavening agent, and baked on sheet pans, or fried in a frying pan. A scone can be either lightly sweetened or savoury, and can be occasionally glazed with egg wash. The sweetened scone is a basic component of the cream tea, and the afternoon tea. It differs from teacakes and other types of sweet breads that are made with yeast. Scones were chosen as Ireland's representative for Café Europe during the Austrian presidency of the European Union in 2006.

In cooking, proofing (also called proving) is a step in the preparation of yeast bread and other baked goods in which the dough is allowed to rest and rise a final time before baking. During this rest period, yeast ferments the dough and produces gases, thereby leavening the dough.

A saltine or soda cracker is a thin, usually square, cracker, made from white flour, sometimes yeast (although many are yeast-free), fat, and baking soda, with most varieties lightly sprinkled with coarse salt. It has perforations over its surface, as well as a distinctively dry and crisp texture. It is normally paired with a variety of savory toppings, including cheese (especially cream cheese), peanut butter, hummus, and various spreads like pimiento cheese, as well as sweet toppings like jam or honey. They are often crumbled into soups, stews, or chili.

Some familiar brand names of saltine crackers in the Americas are Christie's Premium Plus (Canada), Nabisco's Premium (U.S.), Sunshine Biscuits' Krispy (U.S.), Keebler's Zesta (U.S.) (both owned by Kellogg's), Molinos Modernos' Hatuey (Dominican Republic) and Noel's Saltín (Colombia). Unsalted tops as well as whole-grain saltines can also be found.