Otherworld has been called by many different names in differnt religions. The Greeks called it Hades, Christians call it heaven, and more wiccans call it summerland.
Otherworld is a place and home of the Lord and Lady. It is where souls go to choose rebirth or to become a guardian spirit to love ones still on Earth.
The Otherworld is a covered by a vail which is thinnest on the Full Moon Esbat and on the Sabbat of Samhain.
It is also said that during Samhain, spirits of the otherworld roam the world looking for final peace.
"Member of Divine Essence"