Rook endings have drawish tendencies but not all rook endings are drawn. In the typical rook ending, in which both sides have three pawns on the kingside while White has an extra pawn on the queenside, White has good winning chances if his extra pawn is the c-pawn.
This ending occurred in the match between Magnus Carlsen and Daniil Dubov, and objectively Carlsen was indeed winning. However, finding a win in such an endgame in a rapid game with only seconds on the clock is not easy. But in the analysis after the game Zoran Petronijevic found a win for White: