Clutching

What is the difference between slipping the clutch and dragging the clutch?Trying to improve my take off and feel as though I might be dragging the clutch.  

It's all bike talk he said she said. But i would think slipping the clutch is more like a rolling action like when your doing a rolling wheelie. you pull the clutch in just enough to make it slip then grab again to pop you up. I would think to actually drag a bike clutch you would be putting out so much power with the motor the clutch cant keep up. Like a burnt clutch slowly pick up speed till it can grab.It's that initial engagement that can give you a surprise once your past that it's throttle on throttle off lol. I hope maybe this is what you were getting at but feel free to correct me.