Ayahuasca is a name well known by a variety of different indigenous groups in Peru.
It is most commonly consumed by people from indigenous groups in liquid form as part of the ayahuasca ceremony in Bali that is aimed to connect with the supernatural power of the sky or the spirits of the forest.
The psychotropic effects of drinks are something that is affected by three beta-carboline alkaloids. Because of their great ability to intensify and also to extend their great effect, other natural elements such as tobacco leaves can also be combined with wine.
When it comes to the Ayahuasca ceremony, it is something that usually contains drinking hallucinogenic plant/vine tea mixture under the proper guidance of the person concerned.
Ayahuasca is found in Amazon and is also completely authorized there, where retreats and rites are organized and also really official, but not in some countries, where the action is still underground and completely confidential.
If you are considering joining the ceremony, you should be fully prepared to face the divine, infinite, mystery, no matter what you choose to call it, which is outside the limited perspective of your mind. In addition, you must be ready to accept that the mystery/infinite/divine cannot be felt in a way that tends to make sense to your brain.