The Rook Endgame is a phase in chess where only a few pieces remain on the board, typically involving rooks and pawns. In this endgame, the player with the rook often aims to control open files and ranks, using the rook's long-range capabilities to attack the opponent's pawns and protect their own. Key strategies in a Rook Endgame include activating the rook, coordinating it with pawns, and creating passed pawns. Players must also be aware of the opposition, which refers to the positioning of the kings, as it can significantly influence the outcome of the endgame.