King and pawn versus king endgame
The chess endgame with a king and a pawn versus a king is one of the most important and fundamental endgames, other than the basic checkmates. It is an important endgame for chess players to master, since most other endgames have the potential of reducing to this type of endgame via exchanges of pieces.
Source: Wikipedia — King and pawn versus king endgame (CC BY-SA 4.0)