Types of cheese in the context of "Spaghetti alla carbonara"

Cheese is a type of dairy product produced in a range of flavors, textures, and forms by coagulation of the milk protein casein. It is composed of proteins and fat from milk, usually of cows, goats or sheep, and sometimes of water buffalo. During production, milk is usually acidified and either the enzymes of rennet or bacterial enzymes with similar activity are added to cause the casein to coagulate. The solid curds are then separated from the liquid whey and pressed into finished cheese. Some cheeses have aromatic molds on the rind, the outer layer, or throughout.

Over a thousand types of cheese exist, produced in various countries. Their styles, textures and flavors depend on the origin of the milk (including the animal's diet), whether they have been pasteurised, the butterfat content, the bacteria and mold, the processing, and how long they have been aged. Herbs, spices, or wood smoke may be used as flavoring agents. Other added ingredients may include black pepper, garlic, chives or cranberries. A cheesemonger, or specialist seller of cheeses, may have expertise with selecting, purchasing, receiving, storing and ripening cheeses.

Parmesan (Italian: Parmigiano Reggiano, pronounced [parmiˈdʒaːno redˈdʒaːno]) is an Italian hard, granular cheese produced from cow's milk and aged at least 12 months. It is a grana-type cheese, along with Grana Padano, the historic Granone Lodigiano [it], and others.

The term Parmesan may refer to either Parmigiano Reggiano or, when outside the European Union and Lisbon Agreement countries, a locally produced imitation.

Cheese ripening, alternatively cheese maturation or affinage, is a process in cheesemaking. It is responsible for the distinct flavour of cheese, and through the modification of "ripening agents", determines the features that define many different varieties of cheeses, such as taste, texture, and body. The process is "characterized by a series of complex physical, chemical and microbiological changes" that incorporates the agents of "bacteria and enzymes of the milk, lactic culture, rennet, lipases, added moulds or yeasts, and environmental contaminants". The majority of cheese is ripened, except for fresh cheese.

Pecorino is an Italian hard cheese produced from sheep's milk. The name pecorino derives from pecora, which means 'sheep' in Italian.