  This book introduces several new classes of groupoid, like polynomial
groupoids, matrix groupoids, interval groupoids,polynomial interval groupoids,
matrix interval groupoids and their neutrosophic analogues.
  Interval groupoid happens to be the first non-associative structure
constructed using intervals built using Zn or Z or Q or R or Z+ \cup {0} or Q+
\cup {0} and so on.
  This book has five chapters. Chapter one is introductory in nature. In
chapter two new classes of groupoids and interval groupoids are defined and
described. The analogous neutrosophic study is carried out in chapter three.
The applications of this new structure is given in chapter four. The final
chapter suggests more than 200 problems. This book has given 77 new
definitions, 426 examples of these new notions and over 150 theorems.
