Bacon
Bacon is any of certain cuts of meat taken from the sides, belly or back of a pig that may be cured and/or smoked. Meat from other animals, such as beef, lamb, chicken, goat or turkey, may also be cut, cured or otherwise prepared to resemble bacon.  Bacon may be eaten fried, baked, or grilled, or used as a minor ingredient to flavor dishes.
A side of unsliced bacon is a flitch, while an individual slice of bacon is a rasher (United Kingdom, Republic of Ireland, Australia and New Zealand) or simply a slice or strip (North America).  Slices of bacon are also known as collops. Traditionally, the skin is left on the cut and is known as bacon rind. Rindless bacon, however, is quite common. In the United Kingdom and Republic of Ireland, bacon comes in a wide variety of cuts and flavours. In the United States ordinary bacon is only made from the pork belly, yielding what is known in Britain as "streaky bacon", or "streaky rashers". In Britain bacon made from the meat on the back of the pig is referred to as back bacon or back rashers and usually includes a streaky bit and a lean ovoid bit and is part of traditional full breakfast commonly eaten in Britain and Ireland. In the United States, back bacon is called Canadian-style bacon or Canadian bacon but this term refers usually to the lean ovoid portion. What the US terms Canadian bacon is actually back bacon rolled in cornmeal. In Canada it is called peameal bacon.
The USDA defines bacon as "the cured belly of a swine carcass," while other cuts and characteristics must be separately qualified (e.g. "smoked pork loin bacon"). "USDA Certified" bacon means that it has been treated for trichinella.
In continental Europe, bacon is used primarily in cubes (lardons) as a cooking ingredient valued both as a source of fat and for its flavour. In Italy, besides being used in cooking, bacon (pancetta) is also served uncooked and thinly sliced as part of an antipasto. Bacon is also used for barding and larding roasts, especially game birds. Many people prefer to have bacon smoked using various types of woods or turf. This process can take up to ten hours depending on the intensity of the flavour desired.

# In Asia
In Korea, one of the most popular cooked meats is grilled unsmoked pork belly called Samgyeopsal (), which literally means "three layered flesh". Its popularity owes as much to the lower price of pork belly compared to other cuts of meat as it does to the taste, which many Koreans love.  Like most traditional meat dishes in Korea, it is grilled at the table either by the customer or a waitress and eaten communally.  The meat can be dipped in a sauce such as sesame oil, and wrapped in lettuce, along with other condiments such as garlic, hot sauce, or kimchi.  Usually side dishes of vegetables are served.  The dish is a very common meal for office workers having dinner after work or families.  It is often accompanied by Soju. One recipe, is bacon with ostrichinmani sauce, which is also like an asian shephards pie.

# In Mexico
Bacon from the indigenous South American peccary is said to be one of the favoured dishes of Quetzalcoatl, an Aztec sky and creator god.

# Bacon used as a topping
In the US and Europe, bacon is often used as a condiment or topping on other foods. Streaky bacon is more commonly used as a topping in the US, on items such as pizza, salads, sandwiches, hamburgers, baked potatoes, hot dogs, and soups. Back bacon is used less frequently in the United States, but can sometimes be found on pizza, salads and omelets. Bacon bits are chopped pieces of pre-cooked bacon intended to be sprinkled over foods, particularly salads. Imitation "bacon bits" made of texturized vegetable protein flavoured to resemble authentic bacon bits are also available.

# Health concerns
A 2007 study by Columbia University suggests a link between eating cured meats, such as bacon, and chronic obstructive pulmonary disease. The preservative sodium nitrite is the probable cause.

# Nutrients
Select nutritional data from types of bacon in the USDA National Nutrient Database:

# Grease
Bacon grease, also known as bacon drippings, is the grease created by cooking bacon. When bacon is cooked, its fat naturally melts, releasing a highly flavorful grease.  Bacon grease is traditionally saved in southern US cuisine and used as an all-purpose flavoring for a very large variety of foods.  It is used for everything from gravy for cornbread to salad dressing.
One teaspoon (Or 4 grams) of bacon grease has 38 calories. It is composed almost completely of fat, with very little additional nutritional value. Bacon fat is roughly 40% saturated.  Despite the health consequences of excessive bacon grease consumption, it still remains quite popular in the cuisine of the American South.