‘Castling’ is related to which of the following sports?

The correct answer is Chess.

Explanation:
Castling is a special, unique move in the game of chess that involves two pieces of the same color: the King and one of the Rooks. It is the only move in chess where a player can move two pieces simultaneously in a single turn, and it is also the only move where the King can move more than one square.

During castling, the King is moved two squares toward a Rook, and that Rook is then placed on the square the King just crossed. The primary purposes of castling are to bring the King to a safer, guarded position near the side of the board and to activate the Rook by bringing it closer to the center of the game.

For a player to perform castling, several conditions must be satisfied:
1. Neither the King nor the chosen Rook has moved previously in the game.
2. All squares between the King and the Rook must be completely unoccupied.
3. The King must not currently be in check.
4. The King cannot pass through or land on any square that is actively under attack by an opponent's piece.