CSGO is one of the most popular online First Person Shooting game in the world. People around the world have made a career playing and streaming this game. Many games will come and go but Counter strike in some form will always stay. The professional circuit involves international tournaments. The game has 2 teams terrorist and counter-terrorists. There are various scenarios like bomb diffusal, hostages etc. The job of the counter-terrorist is to stop the terrorist.
There is a map view as well as the players can communicate over headphone just like how top armed forces co-ordinate when on a mission. There is a huge range of weapons available and loadout options.
If you are looking to enter the realms of professional gaming than this is the game to play.