What is the difference between a time signature of 2/4 and 4/4 in music?

The main difference between a time signature of 2/4 and 4/4 in music is the number of beats in a measure. In 2/4, there are 2 beats per measure, with a quarter note receiving one beat. In 4/4, there are 4 beats per measure, with a quarter note still receiving one beat.