It is constant for a song.
It tells you how many beats are in each measure.(A measure is a segment if time in music, separated by vertical lines on the staff).
denominator - the type of the note equals one beat. Quarter note, 8th note, 16th note and 32nd note
numerator - how many beats are in each measure.
தாள நடைகள்
2/4 - தக 4/4 - தகதிமி 3/4 - தகிட 6/8 - தகிட தகிட 5/8 - தக தகிட 7/8 - தகிட தகதிமி