The textbook deals mainly with the iterative methods to solve nonlinear and linear systems of equations. The book is distributed into five chapters. After a brief introduction in the first chapter, we study cubic convergent iterative methods in chapter 2. In chapter 3, we consider higher-order convergent iterative methods. The rate of convergence of these proposed methods is obtained. Numerical examples are presented to support the proposed methods being more efficient than the existing methods. Whereas, In chapter 4, we proposed iterative methods for solving the linear system of equations....