The Deck
A deck consists of 52 cards. These cards are divided into 4 suits, with each suit having 13 ranks.
The Four Suits
The suits are all of equal value. That is to say, no suit is higher than any other suit.
Spades Hearts Diamonds Clubs
The Thirteen Ranks
In poker, the Ace is the highest card and the Deuce (2) is the lowest. However, the Ace can be used as a low card to form the straight 5432A.
Source pokertips.org