Body language heat down to what you are communicating without speaking. These nonverbal signal can include your posture and eye contact as well as toe tapping, pen clicking, and other common actions you may not think about. Hand gestures can be an important part of your message to the interviewer. Simple, rare hand gestures highlight what you are saying.

Thank you.

Hello there

First of all I want to tell you a clear definition of body language which means the way of your communication and how you are expressing your feelings along with your posture, gesture, facial expressions and your movements  which includes both your body and your hands according to the conversation.

Try to do these things to make your interview more effective:

• Always make yourself prepare before the interview according to the the domain into which you are going to give your interview.
• Make yourself aware in the waiting room.
• Always maintain good posture in front of the interviewers.
• Just keeps your palms open.
• Try to make eye contact along with your communication.
• Try to response as soon as possible you can to every question or in every circumstances which happened with you in the interview room.

I hope it helps you!

Good luck!