Word mudra originates from the ancient Sanskrit language and it means "seal" or "gesture".
In yoga these hand gestures are used to direct energy flow in the body, because different areas of the hand stimulate specific areas of the brain. Therefore giving some light pressure to some particular area of the hand activates the corresponding space in the brain. On top of that, these positions are also connected to our emotions and feelings.
Next week more about different mudras and their benefits.