Improvisation to the feeling of music as it is in progress is what social dance is about. This possibly stems from the relatively structured appearance of competitive ballroom dancing. Although dance takes many forms, one could categorize dance as performance or social. Performance implies a practiced routine, fairly consistent with each iteration, primarily for the enjoyment of an audience. Social dance, in comparison, implies improvisation and spontaneity of movement, steps, and expression.
Social dance is primarily for the dancers.
It is in this purpose that I distinguish between Social Ballroom and International or Competitive Ballroom. International Ballroom encompasses established steps, patterns, and physical and facial expressions. Each form has its appeal. I prefer a much freer approach to ballroom, which I call Social Ballroom. But, it is in the free interpretation of the music and mood that makes the dance so enjoyable for me.