One of the most easiest checkmate is the Corridor Checkmate.
The Black King is in the corner and cannot escape to h7 or f7 because of the pawns. The e8 square, on the eighth rank, is weak. The e8 square is only defended by the Rook on d8. it is attacked twice by the Rook and the Queen.
It is very clear that black has bank rank weakness. If the black Queen was somewhere on the eighth rank then black wouldn't have this type of problem.
The mate is only delayed by one move because this time the King is on f8.
Now I will show you a game that uses the Corridor Checkmate