There is an Etheric sheath surround our body, which extends three to four inches (8-10 cm). The etheric sheath is a very misty layer, which is nearest to the physical body and it is closely integrated with it, but vibrates at a higher level. Hence, it projects out just a little from the body. The sheath is a spiritual blueprint from which the physical and psychological body develops.
The etheric shield is a pale magenta and when the person is highly spiritually developed their aura is white. Those who communicate in a peaceful and are relaxed produce a blueish energy colour. When you come across those with cobalt blue etheric sheath, they are usually found to be some sort of teacher, who are good communicators and are passionate about their profession. When you visualize a violet sheath on someone, this usually denotes someone with dignity, perhaps someone in religious work.
The etheric body helps to transfer life force energy (prana) from the universe to the physical body.