This chapter covers useful operations of the NumPy library in Python language. The goal of this chapter is to provide knowledge of some basics and advanced functionalities of the NumPy Library (Ver 1.25.0). All the learners with basic knowledge of the Python programming language are the target audience of this chapter. The readers will be able to handle and process data elements stored in n-dimensional Arrays that can be used in many applications where wide variety of mathematical operations on arrays are required, like Data Science, Machine Learning etc.