The difference between voile curtains and net curtains is that they are manufactured differently. Voile curtains are woven instead of knitted. Voiles have a higher thread count and the material is much more fluid and have a silky feel. Voile curtains will need to have the edges finished off such as side hems or the edges will fray. Sheer Curtains are generally referred to because the fabric is transparent and home owners can easily see outside.