The rows of a chess board going up and down, lettered a-h (lower case), with “a” always on White’s left (and Black’s right).

A row of eight squares from one end of the chessboard to the other. In Algebraic Notation these are labelled a to h, starting from the queenside of the board.

A column of the chessboard. A specific file can be named either using its position in algebraic notation, a–h, or by using its position in descriptive notation. For example, "f-file" and "king bishop file" both denote the squares f1–f8 (or KB1–KB8 in descriptive notation).