What are the differences between playing music in 6/8 time signature and 4/4 time signature?

The main difference between playing music in 6/8 time signature and 4/4 time signature is the way the beats are grouped. In 6/8 time, there are 6 beats per measure, grouped into two sets of three eighth notes. This gives the music a flowing, compound feel. In contrast, 4/4 time has 4 beats per measure, grouped into four quarter notes, creating a more straightforward and steady rhythm.