4X

[7][8][9]

While many computer strategy games arguably contain a similar “explore, expand, exploit, exterminate” cycle,[10] game journalists, developers and enthusiasts generally apply “4X” to a more specific class of games,[10] and contrast 4X games with other strategy games such as Command & Conquer. [17][19] In particular, 4X games offer detailed control over an empire’s economy, while other computer strategy games simplify this in favor of combat-focused gameplay. [31] This is in contrast to other 4X games, such as Master of Orion, that allow players to manage battles on a tactical battle screen.

Source: en.wikipedia.org