Spades is a trick-taking card game in which you must partner with the
player directly across from you to attempt to win the number of tricks
you predicted you would win in your bid. When you bid, you look at
the hand your holding and make a guess as to the number of tricks
you will win. When you are the first player to play a card, other
players must follow suit, as long as they have a card of that same suit.
If not, the player can throw a card of any suit, including a spade
which is always trump. The player with the highest card wins the trick.
Credit: host icardgames.com.