In the first diagram below the e4 square is a light colored square intersecting the 4th rank.
Chess board layout letters numbers.
The board also has diagonals from h1 to a8 for example.
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In english speaking countries the parallel method of descriptive notation was generally used in chess publications.
Algebraic which uses a single letter and number to name each square and a letter for each chess piece.
Algebraic notation or an is a method for recording and describing the moves in a game of chess it is based on a system of coordinates to uniquely identify each square on the chessboard it is now standard among all chess organizations and most books magazines and newspapers.
The chess board is divided by eight horizontal ranks from numbers 1 8 and eight vertical files from letters a h so that each of the 64 squares on the board can be identified.
One kind of notation however is universally understood.
Some chess boards have letters across the top and bottom denoting the ranks which are the rows that go from side to side across the chessboard.
This notation system replaced the older english descriptive notation which used an abbreviated.