Kava is a herbal remedy which is extracted from the plant of Piper Mythesticum. This plant is found in the islands of the Pacific Ocean. The name of this plant literally means Intoxicating Pepper. Fiji and Tonga are the people who live in these areas and they have been using this herb for hundreds of years as a drink in their social gatherings. They consider it a part of their tradition.
The roots are dried out, crushed and then added into the water to create a drink which has medicinal benefits. The people use it during their religious ceremonies as well to create a state of Altered Consciousness. This herb has some extraordinary benefits. You can read more about Kava and the health benefits here.