It is a  rhythmical movement to music that is typically said to follow a sequence to step. Dance is an art form often classified as a sport, consisting of sequences of body movements with aesthetics and often symbolic value either improvised which is purposefully selected. Dance can be categorised and described by its choreography or its repetitive movements and by its historical period or place of origin. Dance is typically performed with music and sometimes simultaneously using a musical instrument.
It allows the student a safe space to express themself and improve the condition of the heart and lungs to increase muscular strength, endurance and motor fitness as well to increase aerobic fitness, muscle tone and strength. 
It's also allows the student the freedom to use music as an art expression and to build and grow their confidence.