Technically the game is won when a king is captured, though in practice defeat is conceded at mate or when mate becomes inevitable.
A traditional (shogi board) displaying a set of koma (pieces).
The pieces on the far side are turned to show their promoted values.
The stands on either side are komadai used to hold captured pieces.
The board itself is raised for the comfort of players seated on tatami mats (background), and is hollowed underneath to produce a pleasing sound when the pieces are moved.
Read more here about Shogi.