What is the difference between teaching the violin or playing on the violin?

Not necessarily be every teacher of the violin (musicians) and vice versa is also not necessarily be the musician's violin teacher, teaching is not associated with playing, but is associated with the skills and experience of teaching the musical instrument that will be taught in addition to some skill playing is not required to be reluctant professional 

As for the violin player is a person who received lessons at the hands of a teacher and continued to play and do not have the experience and methods of teaching violin

To play the violin is the performance, its the way you perform your music on violin using the techniques and skills you know by practicing to play the music on the violin. Teaching violin is the process that you give your students the techniques and the basics of playing the violin, starting from how to hold the bow, how to hold the violin, how to use your right hand using the bow, how we put our fingers on the finger board and choosing the notes, scales, techniques, .. etc.