The textbook "On Asymptotic Approximation by Some Positive Linear Operators" by Santosh Kumar Sinha offers a comprehensive examination of approximation theory, which deals with the selection of functions from a specific class. The aim is to find a function that approximates a given function in a defined sense of accuracy. The book addresses the challenges of linear approximation by raising the question of whether it is possible to find a linear combination of functions that closely approximates a given function in a specified space. It discusses both the selection of function sets and the measurement of the deviation between the approximating function and the given function. The theoretical foundations are supported by mathematical concepts and norms that are essential for understanding approximation.