The Battlefield franchise is a series of computer and console games that started with the Windows/Mac game Battlefield 1942. The series is developed by the Swedish company EA Digital Illusions CE, and published by Electronic Arts. The games feature a greater focus on large maps and vehicle warfare than traditional first person shooters. The PC games in the series are mainly focused on online multiplayer. The Battlefield series has sold 17 million units as of 2008. The series has a recognizable 6-beat sting which is often used in promotional material for the games.
Battlefield series games usually focus on large, online multiplayer battles, with emphasis on piloting a number of vehicles as well as team-based infantry combat. Playing in squads has also become a major element of games in the series.
Since Battlefield 2, all games in the series centrally record online statistics for each player allowing the players to receive rank promotions and weapon unlocks based on their statistics as well as awards such as medals, ribbons and pins.
A class system has been present within all the Battlefield games. Each class features a different type of primary weapon along with different equipment, differentiating roles on the battlefield.
The ability to melee other players with a knife has always been present in Battlefield games. Also since Battlefield 2142, the series has included an award of dog tags for each player killed using a knife. 
Codename Eagle, released in November 1999, was the predecessor to the Battlefield series, using the Refractor graphics engine that formed the basis of Battlefield 1942. Battlefield 1942 was released on September 10, 2002, and introduced the "Conquest" gameplay mode, in which players fought for "capture points" throughout the map. The game marked a turning point in first-person shooters towards teamwork objectives rather than deathmatch play. Two expansion packs were released, The Road to Rome and Secret Weapons of WWII. Battlefield Vietnam, released in 2004, moved the setting to the Vietnam War, and was built on a modified Battlefield 1942 engine with various gameplay improvements.
The 2005 game Battlefield 2 takes place in the modern day, during a fictional war between the United States, China, and the fictional Middle Eastern Coalition (MEC). While requiring numerous software patches due to the large number of bugs and glitches in the game upon its release, it was a commercial success, selling over 2,250,000 copies worldwide, as of July 2006. It also received widespread critical acclaim, with an aggregate review score of 91%. One expansion pack, Special Forces, and two booster packs, Armored Fury and Euro Force, were also released. A version of the game called Battlefield 2: Modern Combat was released for consoles, with an improved single player mode but more limited online play.
Battlefield 2142 was released in 2006, taking place during a global ice age in the 22nd century. While much of its gameplay is similar to Battlefield 2, it introduced a variety of equippable items to unlock and battles between two giant "Titan" airships. Its use of in-game advertising was controversial among players. While generally praised by critics, it received lower review scores than its predecessors, with an average GameRankings score of 80%. The Northern Strike booster pack was later released, including new maps, vehicles, and a new game mode.
In 2008, EA released Battlefield: Bad Company, which follows the infamous "B" Company's AWOL escapades and their search for mercenary gold. This new, modern day Battlefield game has modern day weapons, as well as a variety of vehicles for land, air and sea. It has a remarkably realistic destruction system that allows you to break, destroy, or create new environments. In 2009, EA released Battlefield Heroes, a free-to-play download-only game supported by advertising and micropayments. Battlefield 1943, also download-only, was released in July 2009, on Xbox 360 and PlayStation 3, while scheduled for release in Q1 2010, for Microsoft Windows.  In 2010, a direct sequel to Battlefield: Bad Company, Battlefield: Bad Company 2, was released, involving "B" Company's search for an EMP (called a scalar weapon ingame). It has a larger, and arguably better multiplayer with updated graphics and new realistic effects, like bullet-drop and an even higher emphasis on squad based combat. It also features a "VIP" system of content distribution where player with VIP codes gain free access to new maps released periodically. DICE has announced the first expansion for Bad Company 2, Battlefield: Bad Company 2 Vietnam.Battlefield 3 Beta is included when you pre-order Medal of Honor.
- ↑ http://www.gamasutra.com/php-bin/news_index.php?story=21167
- ↑ http://www.1up.com/do/feature?cId=3178381
- ↑ http://www.joeleriksson.com/
- ↑ http://www.gamespot.com/pc/action/battlefield2142/news.html?sid=6150162&mode=previews
- ↑ Digital Illusions Interim report January-June 2006. Archived from the original on 2006-10-10 Retrieved on 2010-05-02.
- ↑ Metacritic: Battlefield 2. Retrieved on 2006-05-20.
- ↑ Klepek, Patrick (2006-10-19). Gamers Wary of Battlefield 2142's 'Spyware'. 1UP.com. Retrieved on 2006-10-20.
- ↑ "Game Rankings Rating". Game Rankings. http://www.gamerankings.com/htmlpages2/932358.asp. Retrieved 2007-08-04.
- ↑ Reilly, Jim (June 10, 2009). EA Confirms Battlefield 3 Development. IGN. Retrieved on 2009-06-20.