Wikipedia
Counter-Strike (also known as Half-Life: Counter-Strike) is a first-person shooter video game developed by Valve Corporation. It was initially developed and released as a Half-Life modification by Minh "Gooseman" Le and Jess Cliffe in 1999, before Le and Cliffe were hired and the game's intellectual property acquired. Counter-Strike was first released by Valve on the Microsoft Windows platform in 2000. The game later spawned a franchise, and is the first installment in the Counter-Strike series. Several remakes and Ports of Counter-Strike have been released on the Xbox console, as well as OS X and Linux. It is sometimes referred to as Counter-Strike 1.6 to distinguish it from other titles of the series, 1.6 being the final major software update the game received.
Set in various locations around the globe, players assume the roles of members of combating teams of the governmental counter-terrorist forces and various terrorist militants opposing them. During each round of gameplay, the two teams are tasked with defeating the other by the means of either achieving the map's objectives, or else eliminating all of the enemy combatants. Each player may customize their arsenal of weapons and accessories at the beginning of every match, with currency being earned after the end of each round.
Counter-Strike (officially abbreviated as CS) is a series of multiplayer first-person shooter video games, in which teams of terrorists and counter-terrorists battle to, respectively, perpetrate an act of terror (bombing, hostage-taking) and prevent it (bomb defusal, hostage rescue). The series began on Windows in 1999 with the first version of Counter-Strike. It was initially released as a modification for Half-Life and designed by Minh "Gooseman" Le and Jess "Cliffe" Cliffe, before the rights to the game's intellectual property were acquired by Valve Corporation, the developers of Half-Life.
The game was followed-up with Counter-Strike: Condition Zero, developed by Turtle Rock Studios and released in 2004. Later that same year, Counter-Strike: Source was released by Valve. Released only eight months after Counter-Strike: Condition Zero, in November 2004, the game was a remake of the original Counter-Strike and the first in the series to run on Valve's newly created Source engine. The fourth game in the main series to have been developed by Valve, Counter-Strike: Global Offensive, was released in 2012 for Windows, OS X, Xbox 360, and PlayStation 3. Hidden Path Entertainment, who also worked on Counter-Strike: Source post-release, helped to develop the game alongside Valve. Several spin-off titles have been released for Asian territories.