Dominion is a card game. Find out about the cards here.
Kingdom Cards
The Kingdom Cards have their own page here: http://dominioncg.wikia.com/wiki/Kingdom_Cards
Although you may want to go straight to:
Seaside Kingdom Cards Promotional Kingdom Cards
Basic Cards
The Basic Cards (Cards in every game) have their own page here: http://dominioncg.wikia.com/wiki/Basic_Cards
Although you may want to go straight to: Copper