The Drive:

• Take short steps to position yourself, and step forward with your non-racquet foot as you are about to hit the shuttle. 
• Turn your non-racquet shoulder to face your target as you draw your racquet back. (Pic 1.) 
• Bend your elbow and cock your wrist back in preparation for the shot. 
• Drive off your back foot as you uncoil your body. 
• Swing your arm forward, straightening your elbow and pushing the racquet through the shuttle. Swing on a flat plane, with no upward motion.
• Strike the shuttle when it's about a foot or two in front of your body. ( Pic 2.) 
• Snap your wrist as the racquet strikes the shuttle. Hit with a vertical racquet face to drive the shuttle forward on a flat trajectory, just over the top of the net. (Pic 3.) 
• Follow through in line with the flight of the shuttle. 
• Land with your weight on your front foot. 
• Recover quickly to your ready position.
  
  

Source : ehow.com