PadmaPadma means Lotus. This posture is like a lotus. This Asana is very good for meditation and Pranayama. It is a posture to sit comfortably. Gauthama Buddha got enlightenment when he was in this posture. Guidance of a teacher is a must to practice this Asana.
There are done using hands and fingers. Mudras is expression of feelings which is used in different fields like
1. Expression of feelings in dance
2. During the worship
3. In Yogabhayasa.