Call of Duty is a first-person shooter video game franchise.

The series began on Microsoft Windows, and later expanded to consoles and handhelds.

Several spin-off games have been released.

The earlier games in the series are set primarily in World War II, including Call of Duty, Call of Duty 2, and Call of Duty 3.

Beginning with , which is set in modern times, the series has shifted focus away from World War II.

Modern Warfare, released November 2007, was followed by and .

, released November 2010, takes place in the Cold War, while , released November 2011, takes place in a near-future setting.

, released November 2012, takes place mainly in the year 2025.

was released in November 2013.

In May 2014, was announced.

Cheating in video games involves a video game player using non-standard methods to create an advantage or disadvantage beyond normal gameplay, in order to make the game easier or harder.

Cheats may be activated from within the game itself (a cheat code implemented by the original game developers), or created by third-party software (a game trainer) or hardware (a cheat cartridge).

They can also be realized by exploiting software bugs; this may or may not be considered cheating based on whether the bug is considered common knowledge.

Software bugs are very often considered software features and as long as they are common knowledge, it is questionable whether it is cheating.

PC games, also known as computer games or personal computer games, are video games played on a personal computer rather than a dedicated video game console or arcade machine.

Their defining characteristics include a lack of any centralized controlling authority, a greater degree of user control over the video-gaming hardware and software used and a generally greater capacity in input, processing, and output.

Battlefield is a series of first-person shooter video games that started out on Microsoft Windows and OS X with Battlefield 1942, which was released in 2002.

The series is developed by Swedish company EA DICE and is published by American company Electronic Arts.

The series features a particular focus on large maps, teamwork and vehicle warfare, compared to many other first-person shooters.

The PC games in the series are mainly focused on online multiplayer.

The Battlefield series has been played by more than 50 million players worldwide as of 2012, across 11 games and 12 expansion packs released since its inception in 2002.

The series' music has a recognizable 6-beat sting.

Digital distribution (also called content delivery, online distribution, or electronic software distribution (ESD), among others) is the delivery or distribution of media content such as audio, video, software and video games.

The term is generally used to describe distribution over an online delivery medium, such as the Internet, thus bypassing physical distribution methods, such as paper, compact discs, and VHS videocassettes.

The term online distribution is typically applied to freestanding products; downloadable add-ons for other products are more commonly known as downloadable content.

With the advancement of network bandwidth capabilities, online distribution became prominent in the 21st century.