This generally begins with purchasing a commercial bag of processed charcoal briquettes. An alternative to charcoal briquettes is lump charcoal. Lump charcoal is wood that has been turned into charcoal but unlike briquets it has not been ground and shaped. Lump charcoal is a pure form of charcoal and is preferred by many purists who dislike artificial binders used to hold briquets in their shape.
A charcoal chimney starter is a traditional method for getting a consistent heat from the coals. Another method is to use an electric iron to heat the coals. Another common method is to soak the charcoal with aliphatic petroleum solvent (or use pretreated briquettes) and light them in a pyramid formation. Although this last method is one of the quickest and most portable, it can impart undesirable chemical flavors to the meat. Using denatured alcohol ("methyl hydrate", "methylated spirit") instead of commercial petroleum-based lighter fluids avoids this problem.
Once all coals are ashed-over (generally 15-25 minutes, depending on starting technique), they can be spread around the perimeter of the grill with the meat placed in the center for indirect cooking, or piled together for direct cooking. Water-soaked wood chips (such as mesquite, hickory, or fruit trees) can be added to the coals for flavor. As with wood barbecuing, the temperature of the grill is controlled by the amount and distribution of coal within the grill and through careful venting.
For long cooks (up to 18 hours), many cooks find success with the "Minion Method", usually performed in a smoker. The method involves putting a small number of hot coals on top of a full chamber of unlit briquettes. The burning coals will gradually light the unlit coals. By leaving the top air vent all the way open and adjusting the lower vents, a constant temperature of 225 can easily be achieved for up to 18 hours.
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from www.wikipedia.org
The word barbecue is also used to refer to a casual event, usually outdoors or with an outdoor theme, serving food which has been barbecued on the premises. Grilled foods and side dishes may also be served; additionally, many diners enjoy an ice-cold beer in a bottle or can. For this reason many people mistake any outdoor cooking, including grilling, as barbecue, which is frowned upon by devotees. The device used for cooking barbecue can usually be used for both barbecuing and grilling and is often called a barbecue grill by those unaccustomed to slow barbecue, thereby adding to the confusion.