Mudras are hand gestures and finger postures that originate from Eastern philosophies and yogic practices. They are believed to focus subtle energy and symbolically express inner feelings and psychological states. Different mudras impact the body's elements and channels in ways that can generate qualities like fearlessness or help cure illnesses. Common mudras described in the document include Gyan Mudra for increasing memory and IQ, Vayu Mudra for relieving stomach issues, and Pran Mudra and Apan Mudra which are useful for general health, meditation, and preventing heart attacks.