Manioc is a woody shrub originally from South America, from the same family as Cassava root or Tapioca.
It has been used in Brazil for centuries and it's one of the base ingredients for the native Brazilians tribe’s foods.
In Brazil, its edible flour is obtained by grating the roots, pressing moisture off the obtained grated pulp, and finally drying and roasting it.
It has become immensely popular in North America because it is as close to wheat flour as you can get and still be gluten free. It is also vegan, nuts and grain-free.