Can the king kill opponent in a backward move?

In Chess, a king cannot move backward in the sense of capturing an opponent's piece. The king can only move one square in any direction—horizontally, vertically, or diagonally. If an opponent's piece is in a square that the king can move to, the king can capture it, regardless of the direction of the move. However, a king cannot move into check, meaning it cannot capture a piece if doing so would place it in a position to be threatened by another piece.