Counter-Strike: Source (commonly shortened to CS:S or simply Source) is a computer game developed by Valve Corporation. It is a complete remake of Counter-Strike 1.6 using the Source engine and taking several features from Counter-Strike: Condition Zero. As in the original, Counter-Strike: Source pits a team of Counter-Terrorists against a team of Terrorists in a series of rounds. Each round is won either by completing a mission (such as detonating a bomb or rescuing hostages) or by eliminating all members of the opposing team.
Counter-Strike: Source inherits characteristics from both Half-Life 2, through the look and feel conveyed through textures and movement, and its predecessor, Counter-Strike 1.6, maintaining the gameplay style of its predecessor. The basic gameplay of two teams, terrorists and counter-terrorists, squaring off against each other in a series of rounds in which each team must either complete their objective or eliminate the opposition, has remained unchanged. The two most common types of objectives are bombing and hostages. In competitive play, only maps with bombing objectives are used, since the AI of the hostages has not been improved over previous iterations, and is prone to a number of problems.