Kicker
It is the second card in the player's hand that does not form a combination, it is used to raise a player's hand in case of a tie.
Example
You have 
and your opponent has 
On the board came
You have both a pair of Aces, so we'll use the kicker to determine who win.
Player 1 (win):
Player 2:
A
10
A
6
On the board came
A
8
7
J
2
You have both a pair of Aces, so we'll use the kicker to determine who win.
Player 1 (win):
A
A
J
10
8
Player 2:
A
A
J
8
7
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