Classroom Teaching vs Online Tutoring | 5 Key Differences: Classroom instructing vs on-line tutoring may need some very apparent variations. There are a couple of variations with on-line tutoring ... atOptions = { 'key' : 'a8dfc29b76f8e0e43144f40c1f6e4e79', 'format' : 'iframe', 'height' : 90, 'width' : 728, 'params' : {} }; document.write('');