The book "Stencil (Numerical Analysis)" offers a comprehensive introduction to the concepts and applications of stencils in numerical analysis, particularly in relation to the numerical solution of partial differential equations (PDEs). It discusses the geometric arrangement of nodes used for calculating approximations and explains the fundamentals behind various algorithms. Readers gain insights into the classification of stencils into compact and non-compact forms, with a focus on the layers used for calculations. The book is a valuable resource for students and professionals engaged in mathematical methods and their applications in the natural sciences.