How does a pawn move?

There are generally two ways:-

1. Conventional rule: in which a pawn facing diagonally and closest to other pawn( of different colour), it can capture that pawn and acquire its position.

2. En Passant: It is french method which has been prevailing in International format of Chess. When the pawn is placed in initial position and facing the second pawn( of different colour) in conventional way( as mentioned in first method), suppose it moves two squares to avoid clash; however, second pawn can capture it by considering the first pawn 's move only by single square and acquire position one square less to the movement of first pawn.