Here's what "leading" means in card games:
* The first player to play a card in a trick. This is usually the player to the left of the dealer.
* The player who determines the suit for the trick. The card they play sets the "lead suit," and all other players must follow suit if possible.
Examples of card games where "leading" is important:
* Hearts: The first player leads a card of any suit. Other players must follow suit if they can; if not, they can play any card.
* Spades: Similar to Hearts, the lead suit is determined by the first player's card.
* Bridge: The player who wins the previous trick leads the next trick.
* Euchre: The player who wins the previous trick leads the next trick.
In short, "lead" refers to the act of playing the first card in a trick, which determines the suit that all other players must follow if possible.