A cow (male: bull) is a large, domesticated mammal. Cows are herbivores and are primarily bred to produce beef. Many cows are also specifically bred to make milk; usually upon reaching an older age, those are also slaughtered for beef.
Beef and other red meat is a significant part of the European diet, as well as the United States. Raising cattle takes large amounts of space and resources, which is why beef is generally expensive as a foodstuff.
Bulls are an important cultural symbol for Spain and to some extent other Hispanic countries, with toreros and bullfighting a major part of Catalan culture. The Western zodiac symbol Taurus represents a bull, which also exists in the Chinese zodiac.