Sid Meier’s Civilization V is the fifth offering in the multiaward winning Civilization strategy game series featuring the famous “just one more turn” addictive gameplay that has made it one of the greatest game series of all time.
In Civilization V, players strive to become Ruler of the World by establishing and leading a civilization from the dawn of man into the space age, waging war, conducting diplomacy, discovering new technologies, going head-to-head with some of history’s greatest leaders and building the most powerful empire the world has ever known.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam